Gridview rowupdating doesn't work

[oldfart]

i have a simple task of updating row, on a click of update linkbutton, as\[code\]<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating" DataKeyNames="ID"> <Columns> <asp:TemplateField HeaderText="ID"> <ItemTemplate> <asp:Label ID="Label3" runat="server" Text='<% #Eval("ID") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Mobile"> <ItemTemplate> <asp:Label ID="Label2" runat="server" Text='<% #Eval("Mobile") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="LName"> <EditItemTemplate> <asp:TextBox ID="TextBox1" runat="server" Text='<% #Eval("LName") %>'></asp:TextBox> </EditItemTemplate> <ItemTemplate> <asp:Label ID="Label1" runat="server" Text='<% #Eval("LName") %>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="action"> <ItemTemplate> <asp:LinkButton ID="LinkButton1" runat="server" CommandName="Edit">LinkButton</asp:LinkButton> </ItemTemplate> <EditItemTemplate> <asp:LinkButton ID="LinkButton2" runat="server">Update</asp:LinkButton> </EditItemTemplate> </asp:TemplateField> </Columns> </asp:GridView>\[/code\]at CS page\[code\]protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e) { TextBox t1 = GridView1.Rows[e.RowIndex].FindControl("TextBox1") as TextBox; string s = t1.Text.ToString(); Label3.Text = s;}\[/code\]I tried working on this several times but i don't get any answer. what possible code i am missing or there is any error in a code.Thanks for any assistance.