private void txtLicenseKey_Validating(object sender, CancelEventArgs e)
 {
     GuiUtility.epRequired(epValidation, txtLicenseKey, lblLicenseKey.Text);
 }
 private void txtUserName_Validating(object sender, CancelEventArgs e)
 {
     GuiUtility.epRequired(epValidation, txtUserName, lblUserName.Text);
 }