protected void BtnAdd_Click(object sender, EventArgs e)
 {
     try
     {
         int i = objcust.InsertCustomer(TxtCustomername.Text, TxtAddress.Text, TxtPhoneNo.Text, TxtCity.Text, TxtEmail.Text);
         if (i > 0)
         {
             Response.Write("Customer Added Successfully");
             clear();
         }
         else
         {
             Response.Write("Fail to Add Customer");
         }
     }
     catch (Exception ex)
     {
         Response.Write("There is an error:" + ex);
     }
 }