In my aspx page
<body>
<form id="form1" runat="server">
<div runat ="server" >
<asp:Button ID ="submit" runat ="server" Text ="click me" onclick="submit_Click" />
</div>
</form>
</body>
In my aspx.cs page
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.Sql;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void submit_Click(object sender, EventArgs e)
{
...
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