private void SignInButton_Click(object sender, EventArgs e) { if (loginBLL == null) { loginBLL = new Login_BLL(); } if (!loginBLL.LoginInfoVerify(UserName_TextBox.Text, Password_TextBox.Text)) { //校验用户输入信息 MessageBox.Show(loginBLL.ErrorMessage, "登陆提示"); } else if (loginBLL.UserLogin()) { //用户登录 MessageBox.Show(loginBLL.ErrorMessage, "登陆提示"); } else { //登入成功之后的操作 this.Visible = false; //隐藏当前页 loginBLL.Dispose(); //释放资源 //if (PopUpSindow(new IndexForm() { iForm = this }) == DialogResult.OK) //{ // this.Visible = true; //} Index index = new Index(); index.iForm = this; if (index.ShowDialog() == DialogResult.OK) { this.Visible = true; } } }