C# Corner

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  • CSDownloadURL : Download Contents of a Web PageDec 03, 2000. CSDownloadURL is a class which has two functions - SetURL and DownloadURL. The set URL sets the current URL and GetDownload downloads the URL contents and returns its contents in a string.
  • ADO.NET Database ExplorerJan 20, 2001. The sample connects to the SQL server database and shows you a tree view like interface of all the tables.
  • Get a database table propertiesJan 22, 2001. Get a table properties such as column names, types etc using DataColumn and DataTable.
  • Database Explorer-IVJan 25, 2001. This is version IV of the Database Explorer, which include the support for Access Database with SQL Server.
  • Timer in C#Jan 26, 2001. An article with sample project explains how to work with the Timer control in C# and .NET to write to a text file after few seconds.
  • Implementing Delegates in C#Feb 04, 2001. The Zip file contains two projects. One is VB.Net and the other is C#. Each project is an example of the same use of a delegate. A base class is derived and the delegate calls a method on several classes derived from the base class.
  • Implementing Delegates in C# : Part 2Feb 13, 2001. This is second part of Timothy's Delegates in C# series...
  • Write Relational Data to an XML FileMar 15, 2001. This article shows you how you can write data from a database to an XML file using DataSet.
  • Programming in ADO.NETMar 19, 2001. A simple example shows you how to read a database table in a dataset and display in a list view control.
  • Mail Merge Program - Part 2Mar 21, 2001. This is a simple mail merge program (Part 2). This program reads from the access database (by default) from a specified table.
  • Flames for FunMay 31, 2001. This is my second application using C#. In this Application I used GDI+.
  • Validation Contol in Mobile FormJun 04, 2001. In this article i'll be showing the power of Valiation Control which u can use with Mobile Application.There are total six Valiation Control as provided. Here i am showing four of them in this example and the rest two are Valiationsummary and CustomValidator.
  • Snooping on C#.NET Regular ExpressionsJun 26, 2001. I present here two micro test utils, which will let you play with regular expressions. Regular expression( System.Text.RegularExpressions.Regex ) is a powerful class very useful for parsing, splitting or replacing texts.
  • strnicmp equivalent in C#Aug 07, 2001. C# equivalent strnicmp function in C language. It accepts two input strings along with the number of positions of chars to compare.
  • Populating and Editing a DataGrid in ASP.NETAug 17, 2001. I will show here , how to develop DataGrid, which is able to retrieve data from joined tables and editable.
  • Web Service Between .NET, Java and MS SOAP Toolkit - Part IIAug 24, 2001. Second article in this series dedicated to Web services comes as a sequel to the first one in which I started to tell you how you could build different kind of clients and services using MS SOAP Toolkit, Apache SOAP for Java and .NET Framework.
  • Web Services between .NET, Java and MS SOAP Toolkit: Part 2Aug 24, 2001. This second article in this series dedicated to Web services comes as a sequel to the first one in which I started to tell you how you could build different kind of clients and services using MS SOAP Toolkit, Apache SOAP for Java and .NET Framework.
  • A Simple Multi-threaded TCP/UDP Server and Client V2.Sep 24, 2001. This is the second version of my client/server program. The server and the client can be run on the same machine or on different machines. The following is the brief description of the server and the client programs specifically.
  • Oracle Database ConnectivitySep 26, 2001. This is a GUI based data entry application which shows how to add, modify and delete records using Oracle Database.
  • Oracle Database ViewerOct 17, 2001. This is a GUI based application which connects to an Oracle database depending upon the DSN, username and password that you provide. It then shows the list of tables on the left hand side in the form of a treeview.
  • Mapping Objects to Relational DatabasesNov 01, 2001. The application generates C# Class files for each table in a relational database. I have used Mysql and ODBC.NET for this project. The application only supports MySQL right now.
  • FlashCards Language Program : How to read and save Images in a Sql Server Database using ADO.NETNov 09, 2001. I thought it would be fun to write a simple program that displayed flashcards from a database and at the same time, show you how to read and write images to the database. This program is a simple flashcard program that talks to a single table in a Sql Server Database.
  • Network Programming in C# - Part 1Nov 12, 2001. The .NET framework provides two namespaces, System.Net and System.Net.Sockets for network programming
  • Network Programming in C# - Part 2Nov 12, 2001. This is the second part of the series of articles about the network programming with C#.
  • Exceptions and Exception StackNov 16, 2001. The purpose of this tutorial is to explain firstly how you would go about creating your own set of exceptions to trap error conditions that could occur in your code or library, for your own benefit or for the benefit of another developer using your library. The second lesson is on how the C# exception stack works, and how you can use it to catch all types of exceptions.
  • C# IRC BotNov 19, 2001. This is a very simple program that establishes a connection to irc server, joins a channel and greets every nick that joins.
  • Using Interfaces in .NET RemotingNov 30, 2001. In this article, we will create a remote object that will return rows from a database table. For the sake of simplicity I have used the NorthWind database that is packed with the installation of the Microsoft SQL Server.
  • Debug Troelsen's .NET books (1): IEnumeratorDec 10, 2001. This article examines code problem in chapter 4 (for C#)/chapter 5(for VB.Net) of the two .Net books.
  • Developing a Record Navigation Form with Unbound ControlsDec 26, 2001. Developing a record navigation form with unbound controls. The form enables you to navigate through the records one at a time. In this application we have used a combo box, two text boxes and various command buttons.
  • Overview of Automated TranscationsJan 04, 2002. Two or more .NET Framework objects can participate in the same transaction. One or more .NET Framework objects can participate in the same transaction as one or more COM+ objects. All objects must be hosted in Microsoft Windows 2K Component Services so as to receive services such as transaction processing.
  • Bridge Patterns in C# Jan 17, 2002. Bridge Pattern is commonly known as Handle/Body idiom in C++ community. This pattern is used for decoupling an abstraction from its implementation so that the two can vary independently.
  • FlashCards Language Program : How to read and save Images in a Sql Server Database using ADO.NETFeb 19, 2002. I thought it would be fun to write a simple program that displayed flashcards from a database and at the same time, show you how to read and write images to the database. This program is a simple flashcard program that talks to a single table in a Sql Server Database.
  • A Database Web ServiceFeb 22, 2002. This program is a Web service, which contains Web methods that return a dataset after querying a database (any database) given the connection string, the password, the database, the table, the user ID and the SQL commands.
  • Create a SQL Server Database dynamically in C#Mar 05, 2002. In this article, I’ll show you how to create a new SQL Server database and its objects such as table, stored procedures, views and add and view data. I’ll also show you how to change database table schema programmatically. You’ll see how SQL statement ALTER TABLE is useful when you need to change a database table schema programmatically.
  • A Shaped Windows Forms Application with Variable OpacityMar 11, 2002. This application demonstrates two simple techniques that beginners might find useful in developing creative new looks for Windows applications.
  • JIT CodingMar 11, 2002. One not so well known feature of .NET platform is possibility to invoke compiler and practically create code and assembly from running instance of application. It is possible to do that in two ways. First one is a bit simpler and involves namespaces System.CodeDom and System.CodeDom.Compiler, second one is more efficient and utilizes namespace System.Reflection.Emit. Since there are very few examples about how to use System.CodeDom.Compiler I will start with it.
  • Sending Windows Message in C#Mar 14, 2002. This sample code shows how to send Window messages between two forms using C#.
  • Peer-to-peer Chat Program using Asynchronous SocketMar 22, 2002. This is a simple chat program, which uses asynchronous socket to provide connection between two machines.
  • .NET Remoting: The Interface ApproachMar 26, 2002. In this article, we will create a remote object, and access this object using the Interface. The object returns rows from a database table.
  • Multithreading Part 2: Understanding the System.Threading.Thread ClassApr 08, 2002. In this article we will study the .NET threading API, how to create threads in C#, start and stop them, define their priorities and states.
  • Reflecting Data in .NET Classes - Part IV: From Database TableApr 08, 2002. In this article, we will be looking at how to "reflect" data from the most common data source - Database tables.
  • Outlook Bar ControlApr 18, 2002. This is a simple control similar to the OutlookBar. The attached zip file contains two Visual Studio .NET projects.
  • Drawing B-Spline CurvesApr 22, 2002. The attached source code project draws spline curves between two points.
  • A Database Component: Inserting Serializable ObjectsApr 23, 2002. The attached zip file contains two projects - a database component (DLL) project and a Windows forms project called Test. Both projects are written and compiled using Visual Studio .NET version 1.0.
  • An Editable GridView Control in C# and .NET - Part IIJun 19, 2002. In this article we will take advantage of the XML classes available to us to persist the GridView control that we talked about in our first article in this series. The two classes we utilize in our code are XmlTextWriter and XmlTextReader.
  • An Editable GridView Control in C# and .NET - Part II Persisting in XMLJun 19, 2002. In this article we will take advantage of the XML classes available to us to persist the GridView control that we talked about in our first article in this series. The two classes we utilize in our code are XmlTextWriter and XmlTextReader.
  • Editable GridView Control in C# and .NET - Part-III Printing the GridViewJun 24, 2002. In our last two articles, we talked about how to create an editable GridView and how to make it persistent in XML.
  • Communication Between Two FormsJun 24, 2002. The aim of the program is to send a message between different forms.
  • Communication Between Two Forms: Part-IIJun 24, 2002. Last time I wrote about the possibility of sending a string from a textbox in one form to another.
  • Deploying a COM Component from C#Jul 08, 2002. Here is some code to help you to deploy a COM component from C#. I needed to programmatically deploy a project that would be registered as COM object (not COM+) and be installed into GAC. The following two classes will help in this objective.
  • Validation Server Controls in Web FormsAug 05, 2002. When working with Web applications, developers need to write two separate codes using Java Script and VB Script to validate user inputs.In this article we are going to see, how we can reduce the programmers effort on coding, reducing the execution process time and simplify the code handling and less number of lines in the coding.
  • DataGrid Customiztion Part-III:Implementing Search Feature in a DataBound GridAug 21, 2002. In this article, I will show you how to exchange two DataGrid columns by dragging and dropping.
  • TWINXBASE ServiceSep 09, 2002. This service scans in a directory by using FileWatcher component and when a file arrives, then the service will check the extension of the file, if the file has the extension .DBX then it will read the contents of the file and communicate with the database (C:\FILESERVICE\DB\MyDB.mdb) and insert / update / delete the records in the database -table.
  • Working with COBOL Data Groups in C#Sep 11, 2002. In this article we will begin with a C# console application calling a COBOL DLL file. The C# application will pass it a number of occurrences to create in the table (much like a user requesting a specific number of months to report on).
  • SMTP and POP3 Mail ServerSep 13, 2002. This is simple implementation of SMTP and POP3 server. Two new features are added to the original code.
  • Generating Maze using C# and .NETSep 25, 2002. This article focuses on how to generate a maze using the depth first search algorithm. This is a very simple but clever algorithm that creates a maze by randomly stripping one available wall between two cells for every cell in the grid.
  • Generating Maze using C# and .NETSep 25, 2002. Did you ever get the feeling that cubicles were laid out with the idea that there could be no escape? (Must be I am a bit overworked these days). Today's article focuses on how to generate a maze using the depth first search algorithm. This is a very simple but clever algorithm that creates a maze by randomly stripping one available wall between two cells for every cell in the grid.
  • Accessing Text Files using ODBC Data ProviderNov 12, 2002. In this article, I will show you how to access Access database files using ODBC data provider.
  • Synchronized Threading in .NETDec 11, 2002. Threads are a powerful abstraction for allowing parallelized operations: graphical updates can happen while another thread is performing computations, two threads can handle two simultaneous network requests from a single process, and the list goes on. Since threads are pretty simple to understand, conceptually, but, practically, they are a cause for programmatic headaches, I decided to write this program to describe how to make use of threads.
  • ADO.NET, COBOL and Stored ProcedureDec 13, 2002. A stored procedure is basically a series of SQL statements that reside on the database. The procedure could create a new table, retrieve data from one or more tables, update one or more tables or perform many other tasks.
  • Working with Portable Network Graphics(PNG) Format : Part IDec 13, 2002. First off, why use PNG instead of GIF? Probably the most important reason is that GIF supports a maximum of 256 colors.
  • Cryptography in Microsoft.NET Part II: Digital Envelop and Digital SignaturesDec 18, 2002. Part-I of this article covered cryptography in the context of encryption. This part continues from where part-I left. It assumes that the reader understands the purpose of encryption, knows about the two types of encryption namely asymmetric encryption and symmetric encryption and the fundamental differences between them. It also assumes that the reader understands encryption-decryption classes in System.Security.Cryptography namespace and the stream based encryption model in. NET framework class library (FCL).
  • ChessyOnline 1.0: An Online and Network Chess GameDec 31, 2002. The attached project is a chess game that can be played by two users online as well as on the network.
  • Cryptography in Microsoft.NET Part III: Digital CertificatesJan 08, 2003. Part-I and II of this article discussed the basics of cryptography and its applications in real world enterprise solutions. Part-I discussed the nitty-gritty of encryption and its implementation in Microsoft .NET Framework Class Library (FCL). Part-II discussed the hashing and signature algorithms and their implementation in FCL. It also discussed the two common cryptography applications namely digital envelope & digital signature.
  • Caution When Using SetParentRow of a DataSetJan 13, 2003. I had a serious performance killer when using SetParentRow in the creation of a DataSet in ADO.NET.
  • Speedometer: Applying GDI+ TransformationsFeb 10, 2003. This zip file contains two folders - one folder contains speedometer control and the other contains the application that uses the control. Put both folders in the same location and open the application in VS and run it.
  • J2EE to .NET Migration: Quick TipsMar 26, 2003. Here are some Quick tips to get you started, in case you need to migrate a J2EE based application to a .NET based application.
  • Developing Secure Web Site with ASP.NET and IIS - PartIIMay 07, 2003. Authentication is a very important element of developing secure sites. It is the starting point of a secure environment for the protected resources. I have discussed several authentication mechanisms available in ASP.NET and how they join with IIS to provide a secure platform to develop sites in Part I of this article.
  • Developing Secure Web Site with ASP.NET and IIS: PartIIMay 07, 2003. Authentication is a very important element of developing secure sites. It is the starting point of a secure environment for the protected resources. I have discussed several authentication mechanisms available in ASP.NET and how they join with IIS to provide a secure platform to develop sites in Part I of this article. I will be looking at Form Authentication and how to implement it in several sample web applications.
  • How to Display Data Vertically?May 08, 2003. This article explains how to display data vertically rather than typically horizontal rows.
  • Add Column Dynamically to DataGrid to Display CalculationMay 08, 2003. In this article we'll see how to create a DataGrid column which displays the calculation of more than one field in the database table. The calculation could be addition, multiplication or even filtering rows.
  • Part I: Simple Color Syntax Code Editor for PHP written in C# and .NETJun 18, 2003. The second part of this article shows how to print out the contents of a RichTextBox control.
  • Kuti.DataJul 02, 2003. The attached source code file has two parts - DataObject directory and Automatic SQL Generator.
  • Deleting a DataGrid Data Based on a Column ValueJul 24, 2003. In this article we'll see how to delete the records of a DataGrid based on a column value in the database table.
  • Authentication and Authorization in ASP.NETSep 09, 2003. There are two closely interlinked concepts at the heart of security for distributed applications - authentication and authorization.
  • Understanding Crystal Report ViewersOct 07, 2003. Crystal Report Viewers work as a container of a report and allow us to view a crystal report in Windows and Web applications. Crystal Reports for Visual Studio .NET provides two report viewers – Windows Forms Viewer and Web Forms Viewer.
  • Deployment: Customizing your .NET deployment ProjectsDec 29, 2003. The fact of the matter is that Visual Studio.NET already contains everything you need to create a rich setup experience for your users. In this article we are going to show you two ways to add a readme dialog to your application, the easy way and the hard way. The easy way requires absolutely no coding. The hard way requires coding and actually allows you to add complex custom features to your application.
  • MyQueue in C#Jan 09, 2004. This article attempts to explain the how MSMQ can be implemented between two forms and the very basics of message queuing.
  • Real Life SQL and .NET: Part IIIJan 13, 2004. Welcome to the world of SQL and the huge, growing database technologies of today’s business all over the SQL world. By reading this article, we have begun accepting the knowledge that will soon be required for survival in today’s world of relational database and data management. Alas, for the reason that it is first necessary to provide a background of SQL and cover some preliminary concepts that we need to know, the majority of this article is text in paragraph format.
  • Real Life SQL and .NET: Part IVJan 13, 2004. Welcome to the world of SQL and the huge, growing database technologies of today’s business all over the SQL world. By reading this article, we have begun accepting the knowledge that will soon be required for survival in today’s world of relational database and data management. Alas, for the reason that it is first necessary to provide a background of SQL and cover some preliminary concepts that we need to know, the majority of this article is text in paragraph format.
  • Real Life SQL and .NET: Part IJan 13, 2004. Welcome to the world of SQL and the huge, growing database technologies of today’s business all over the SQL world. By reading this article, we have begun accepting the knowledge that will soon be required for survival in today’s world of relational database and data management. Alas, for the reason that it is first necessary to provide a background of SQL and cover some preliminary concepts that we need to know, the majority of this article is text in paragraph format.
  • Real Life SQL and .NET : using SQL with C#: Part XJan 13, 2004. Welcome to the world of SQL and the huge, growing database technologies of today’s business all over the SQL world. By reading this article, we have begun accepting the knowledge that will soon be required for survival in today’s world of relational database and data management. Alas, for the reason that it is first necessary to provide a background of SQL and cover some preliminary concepts that we need to know, the majority of this article is text in paragraph format.
  • Real Life SQL and .NET : SQL Subqueries: Part VIIJan 13, 2004. Welcome to the world of SQL and the huge, growing database technologies of today’s business all over the SQL world. By reading this article, we have begun accepting the knowledge that will soon be required for survival in today’s world of relational database and data management. Alas, for the reason that it is first necessary to provide a background of SQL and cover some preliminary concepts that we need to know, the majority of this article is text in paragraph format.
  • Directory Services Vs RDBMSFeb 06, 2004. When storing user information, developers can have two choices to choose from - Active directory and a relational database. This article sheds lights on usefulness of each of these and when to use one over the other and vice versa.
  • DataTable Events in C#Feb 17, 2004. The ADO.NET DataSet is a data construct that can contain several relational rowsets, the relations that link those rowsets, and the metadata for each rowset. The DataSet also tracks which fields have changed, their new values and their original values, and can store custom information in its Extended Properties collection. The DataSet can be exported to XML or created from an XML document, thus enabling increased interoperability between applications.
  • New Features in C# 2.0 : Part 1Mar 08, 2004. In a two part series I will explain new features introduces in C# language version 2.0. In this article I will talk about generics.
  • DataSets in Microsoft .NET - Part 2Mar 09, 2004. This article explains sorting, searching and filtering support provided by dataset and data table objects.
  • The Matrix Class and TransformationsApr 01, 2004. Matrices play a vital role in the transformation process. In GDI+, the Matrix class represents a 3×2 matrix that contains x, y, and w values in the first, second, and third columns, respectively.
  • University Student Registration Application in ASP.NETMay 03, 2004. The aim of this project is to implement a Web application, where students can register for an online course. If the user is an administrator, he can add and remove courses and modify the student information.
  • Dynamic SQL Server Database Creation in .NETMay 03, 2004. This article explains step by step dynamic creation of a SQL Server database, tables and stored procedure using Visual Studio codename Whidbey and VB.NET.
  • Working with Tablet PC InkEdit Control in C#Jun 02, 2004. Tablet PC SDK provides two very powerful but easy to use Ink controls for Ink recognition. These two controls are - InkEdit and InkPicture. This article discusses how to work with InkEdit and InkPicture controls.
  • Working with Tablet PC InkPicture Control in C#Jun 24, 2004. Tablet PC SDK provides two very powerful but easy to use Ink controls for Ink recognition. These two controls are - InkEdit and InkPicture. This article discusses how to work with InkPicture control. See Working with Tablet PC InkEdit control to work with InkEdit control.
  • Validating Input Xml Data FilesJun 28, 2004. In this article we'll discus two strategies for validating input XML data files. The validation of an XML input file could occur at various instances of processing.
  • Avoid Memory Leaks with Destructor and DisposeJul 01, 2004. Here are two classes that allocate resources, the first class needs to implement a custom destructor and standard Dispose, but the second class doesn't need either.
  • Simple Messenger in C# and .NETJul 16, 2004. This is a simple messenger application developed in .NET using C#. The attached project has two applications - a server and a client.
  • Adding Discovery Features to BizTalk Server 2004: Part ISep 13, 2004. This article explores the concepts of the BizTalk-UDDI mapping process and the similarity with the WSDL-UDDI mapping process. By the other way the second article is focused in the implementation and use of the BizTalk Server 2004 UDDI Publishing Wizard tool.
  • An in-depth look at WMI and Instrumentation: Part IISep 18, 2004. In this second part of the series, you will learn how to work with WMI classes and class instances, and then demonstrates the wealth of information available through the Win32 and IIS WMI providers.
  • Storing Images into a DatabaseOct 18, 2004. In order to provide your application with cool pictures you can employ two techniques (at least). One of them is that you can save the pictures in a folder and store the path to each one in a database or configuration file. The other one is to store the entire file into a database, along with its file name.
  • How to Populate a DropDownList insides a DataGrid through an XML FileNov 16, 2004. In this article, we will show how to fill a DropDownList inside a DataGrid through an XML file. We will also show how the contents of one DropDownList changes dynamically as we change the index of second DropDownList (both inside the grid).
  • A Chess Program using C#Nov 29, 2004. This is a chess program, made using C#. It has used object oriented concepts and design patterns like Flyweight, Factory and Decorator. Two player can play this game and it has facility to drag-drop pieces. It also shows potential positions of each pieces which is useful for learning.

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