private void BtnLogin_Click(object sender, EventArgs e) { String username = ComboBoxUserName.Text; String password = textBoxUserPassword.Text; var user = ICMDBContext.GetUserByName(username); if (user != null) { //if (ICMServer.Security.MD5Encode(password) == user.C_password) if (password == user.C_password) { this.DialogResult = DialogResult.OK; // open mdiparent main form this.Close(); } else { MessageBox.Show("密码错误"); } } else { MessageBox.Show(String.Format("用户名 {0} 不存在", username)); } }