select the row from Gridview and edit another page.

First of all find

Which row u want to edit the find the selected gridview row id and find the unique value of that row which u want to edit and send this unique value using Response.Redirect("~/UpdateGridView.aspx?EmpNo=" + row.Cells[0].Text)

 

and fetch value from table behalf of this value. If u stuck any where please use bwlow link.

 

http://www.aspsnippets.com/Articles/Pass-Selected-Row-of-ASPNet-GridView-control-to-another-Page.aspx

http://www.aspforums.net/Threads/134802/Solved-How-to-edit-and-update-GridView-Row-on-another-page-in-ASPNet/

http://www.c-sharpcorner.com/UploadFile/15208c/how-to-send-gridview-row-values-to-another-page-and-update-t/