//button event for 'Update' button
 private void btnUpdate_Click(object sender, EventArgs e)
 {
     //if there is no order number entered in field...
     if (txtUpdate.Text == "")
     {
         //print error message
         lblMessage.Text = "Please enter an existing Service Order number.";
     }
         //otherwise
     else
     {
         //if everything is ok...
         //create instance of form
     frmEditUpdate Edit = new frmEditUpdate();
         //display the form
     Edit.Show();
     }           
 }
 //button event for 'Update' button
 private void btnUpdate_Click(object sender, EventArgs e)
 {
     //if there is no order number entered in field...
     if (txtUpdate.Text == "")
     {
         //print error message
         lblMessage.Text = "Please enter an existing Service Order number.";
     }
     //otherwise
     else
     {
         //if everything is ok...
         //create instance of form
         frmEditUpdate Edit = new frmEditUpdate();
         //display the form
         Edit.Show();
     }
 }