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not so easy u dont get my point what i want to sayy..
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To learn more about database queries and how to perform database related actions in .NET framework, please read this article of mine on C# Corner,http://www.c-sharpcorner.com/UploadFile/201fc1/introduction-to-sql/. This covers most of the concepts and you will be on your way to programming for SQL Server in C# (or any other langauge in .NET framework).
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Set a name to those TextBoxes and then once the user has to submit the data, get the values for those TextBoxes. You can do something like,
string updatedValue = myTextBox.Text;
This would then let you have the values. Later, you can use the code to save the data in the database.