private void btnOK_Click(object sender, System.EventArgs e) { if (ServiceHelper.WebServiceHelper.CheckAuthentication(Constant.WebserviceUrl.CheckAuthenticationUrl, txtUserName.Text, txtPassword.Text)) { Form1 frm = new Form1(); Form1.user = txtUserName.Text; Form1.pass = txtPassword.Text; this.Hide(); frm.ShowDialog(); } else { frmError frmErr = new frmError(); frmErr.ShowDialog(); } }