c# sql server connection oop

Welcome to C# Corner. I apologize for being instantly critical. Note that there are very many vague questions and people often ask questions that are answered in articles. So it is common for people to suggest that people refer to articles. I hope you continue to request and receive assistance in these forums. I hope you also use and benefit from the abundant other resources available in this web site.

Please don't use a large font. Please do explain what you need clearly and concisely but do try to provide a complete explanation of what you need help with. I say that because if you do have a question that requires an explanation then a lrge font will make it difficult to read everything.

When you do ask general questions such as here, the best answer is to refer you to the many great articles that this web site has to offer. Please go to the web site's home page and look at the articles for ADO.Net and for Windows Forms, WPF and Silverlight. I would like to suggest my article Database Table Update in a DataGridView without Writing Code, but there are very many other articles for you to read.

This article (http://www.c-sharpcorner.com/UploadFile/suthish_nair/5462/) should help.