link buttons in grid view in asp.net

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ASP.NET

I m using link button in asp.net for handling their event i m using its rowcommand property but it always shows "" (null) value in its e.CommandArgument

this is my code:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
            DataSourceID="SqlDataSource1" DataKeyNames = "id" OnRowCommand = "GridView1_RowCommand">
            <columns>
                 <asp:TemplateField>
                    <itemtemplate>
                        <asp:LinkButton ID="LinkButton1" CommandName = "getid" runat="server" 
                            Text='<%# Eval("id") %>' CommandArgument='<%# Eval("id") %>'>
                    </itemtemplate>
                
            </columns>

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        TextBox1.Text = e.CommandName.ToString();
    }

the field eval("id") is not empty. it contains integer values (1,2,3,4,...)

tell me if i m doing something wrong