Gridview rowupdating doesn't work - asp.net

Question

i have a simple task of updating row, on a click of update linkbutton, as
<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>
at CS page
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;
}
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.

Answer 1

Your LinkButton needs to have a CommandName applied to it in the EditTemplate:
<asp:LinkButton ID="LinkButton2" runat="server" CommandName="Update">Update</asp:LinkButton>