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How to Delete Data from Database Using XML Web Service

Posted by Akshay Teotia Articles | Web Services in C# January 18, 2012
Web Service are software programs that use XML to exchange information with other software via common internet protocols. In a simple sense, Web Services are a way for interacting with objects over the Internet.
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Introduction

In this article I am going to make a XML Web service that updates data into a Default table of the application. For the basics of XML Web Service read my last article. Click Here

First go through SQL Server and make a table.

The following snapshot shows the process.

img1.gif

Database- akshay

Table Name- student

Creating XML Web Service in .Net

Here is sample code which I use to create and consume ASP.NET Web Services.

Step 1 : Create the ASP.NET Web Service Source File.

Open Visual Studio 2010 and create  a new web site.->Select .Net Framework 3.5. ->Select ASP.NET Web Service page -> Then, you have to give the name of your service. In this example I am giving it the name "MyWebService". Then click the OK Button. A screenshot of this activity is shown below.

img2.gif

Step 2 : Click on the "OK" button; you will see the following window:

img3.gif

Here (in the above figure), you will note that there is a predefined method "HelloWorld" which returns the string "Hello World". You can use your own method and can perform other operations. Here I made a simple method "GetDelete" which returns an integer value.

Service.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
// [System.Web.Script.Services.ScriptService]
public class Service : System.Web.Services.WebService
{
    public Service()
    {
        //Uncomment the following line if using designed components
        //InitializeComponent();
    }
    SqlConnection con;
    SqlCommand cmd;
    [WebMethod]
    public int GetDelete(int sn)
    {
        con = new SqlConnection(@"Data Source=.;Initial Catalog=akshay;Persist Security Info=True;User ID=sa;Password=wintellect");
        cmd = new SqlCommand("delete from student where sn=" + sn + " ", con);
        con.Open();
        int roweffected = cmd.ExecuteNonQuery();
        return roweffected;
    }
}

Step 3 : Build the Web Service and Run the Web Service for testing by pressing F5 function key.

img4.gif

Copy the url of this web service for further use.

Step 4 : Click on GetDelete Button to test the web service.

img5.gif

Enter the value of Sn to test the web service.

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By pressing the "Invoke" button a XML file is generated.

img7.gif

The '1' respond to our data is deleted in specific  DataBase table (here "student") see here.

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Now our web service is ready to use. We just need to create a new web site to consume the web service.

Example of Testing Web Service in .Net

Step 5 : Create a Test Web Site by File > New > Web Site > ASP.Net Web Site.

img9.gif

Name the web site; for example here I have chosen the name "MyTest" and clicked on the "ok" button.

Step 6 : Right-click in the Solution Explorer and Choose "Add Web Reference":

img10.gif

Step 7 : Past the url of the web service and click on "Green arrow" button and then "Add reference".

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Step 8 : Now your web service is ready for use; you can see it in the Solution Explorer.

img12.gif

Step 9 : Go to the design of the Default.aspx page; drag and drop one TextBox, one Button and a Lable.

img13.gif

Rename the Button as 'Delete'.

Step 10 : Go to the Default.cs page and on the button click event use the following code:

protected void Button1_Click(object sender, EventArgs e)
{
    int sn = Convert.ToInt32(TextBox1.Text);
    localhost.Service myservice = new localhost.Service();
    int temp= myservice.GetDelete(sn);
    if (temp== 1)
        {
           Label1.Text = "Record is Deleted";
        }
    else
       {
           Label1.Text = "Record is not Deleted Please Try Again";
       }
}

Step 11 : Pressing the F5 function key to run the website, you will see:

img14.gif

Enter the value of TextBox.

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Press the Delete Button.

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The record is deleted; you can check it from your database.

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