How to find the value of textbox from the footer row of gridview in C# ASP.NET

[Dracker2]

\[code\] <FooterTemplate> <asp:TextBox ID="txtSName" runat="server" Text=""/> </FooterTemplate>\[/code\]and the codebehind Code is as:\[code\]TextBox txtName = (TextBox)(GridView1.FooterRow.FindControl("txtSName"));string aa=txtName.Text;\[/code\]Everytime \[code\]aa\[/code\] is \[code\]null\[/code\].this code i m putting into the following:\[code\]protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e){} \[/code\]Please help me..........