protected void DeleteButton_Click(object sender, EventArgs e)
 {
     if (publisherIdTextBox.Text != "")
     {
         int    id      = Convert.ToInt32(publisherIdTextBox.Text);
         string message = publisherManager.DeletePublisher(id);
         Response.Write("<script>alert('" + message + "');</script>");
         LoadAllPublisher();
         publisherIdTextBox.Text = "";
     }
     else
     {
         Response.Write("<script>alert('Please Insert Publisher Id!');</script>");
     }
 }