Checked in Gridview, Button Click for Assign Value to textbox

Hi all,
   I try to complete the action for Button click to achieve checked row in gridview,  below is my asp.net code
   If i click the Edit button , i want to assign gridview row ,column values into their textboxes .. how is it possible explain with code
   
 
//Asp.net <form id="form1" runat="server"> <div> <asp:Label ID="Label1" runat="server" Text="Empid" Width="50px"></asp:Label> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <br /> <asp:Label ID="Label2" runat="server" Text="Name" Width="50px"></asp:Label> <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox> <br /> <asp:Label ID="Label3" r ...