How to write a code for button in a Grid view control..Using c#

You can try this for building the update query:

SqlCommandBuilder build = new SqlCommandBuilder(adapter);

and on update record button click event write the below line:

adapter.Update(dt);

here adapter is a object of SqlDataAdapter and dt is object of DataTable. And make sure your table contains Primary key.

refer this to learn more:
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommandbuilder.aspx?ppud=4[^]

hope it helps :)

for further queries comment here!!