protected void btnSave_Click(object sender, EventArgs e)
 {
     if (Page.IsValid)
     {
         ServiceReference1.User user = new ServiceReference1.User();
         user.Username = Session["username"].ToString();
         user.Email = txtEmail.Text;
         user.Phone_Number = txtPhone.Text;
         user.Gender = ddlGender.SelectedItem.Text;
         ServiceReference1.Service1Client sr = new ServiceReference1.Service1Client();
         if (sr.Update_Info(user) == 1)
         {
             ScriptManager.RegisterStartupScript(this, GetType(), "Thông báo", "alert('Successed !!!');", true);
             Binding_data();
         }
         else
         {
             ScriptManager.RegisterStartupScript(this, GetType(), "Thông báo", "alert('Error: Try again !!!');", true);
         }
     }
 }