private void btnChangePassword_Click(object sender, EventArgs e) { if (ValidateInput()) { try { SystemUser selectedUser = (SystemUser)cmbUserName.SelectedItem; selectedUser.UserNewPassword = txtNewPassword.Text; selectedUser.ChangePassword(); this.DialogResult = DialogResult.OK; } catch (Exception ex) { MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } }