Fetching data from DB if i click on TAB .

namespace Link1
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
DataBind();

}

protected void Button_click(object sender, EventArgs e)
{
MySqlConnection con = new MySqlConnection("server=localhost;user id=root;database=perfautomationdb;password=Password@1");
con.Open();
MySqlCommand cmd = new MySqlCommand("SELECT * FROM tfsperfqueue", con);
MySqlDataAdapter adp = new MySqlDataAdapter(cmd);
DataSet ds = new DataSet();
adp.Fill(ds);
cmd.ExecuteNonQuery();
GridView1.DataSource = ds;
GridView1.DataBind();

}
}
}