Asp.net 用户控件添加自定义事件(2)

用户控件后台代码

public event EventHandler Authenticate;

    protected void Page_Load(object sender, EventArgs e)
    {

    }

    public void Button1_Click(object sender, EventArgs e)
    {
        if (Authenticate!=null)
        {
            Authenticate(this, new EventArgs());//如果用户自定义添加了事件，则该button会按指定的事件进行，而不会走默认事件。相反，会执行默认事件。

        }
        else
        {
            string connectString = "Server=. ; DataBase=Test ; uid=sa ; pwd=cosecose ";
            string selectString = "Select * from userInfo where Name='" + txtName.Text.ToString() + "' and Password='" + txtPassword.Text.ToString() + "'";

            SqlConnection conn = new SqlConnection(connectString);
            conn.Open();

            SqlCommand cmd = new SqlCommand(selectString, conn);

            SqlDataAdapter sda = new SqlDataAdapter();
            sda.SelectCommand = cmd;
            DataTable dt = new DataTable();
            sda.Fill(dt);

            if (dt.Rows.Count == 0)
            {
                Response.Write("<script>window.alert('密码或用户名输入错误！')</script>");
            }
            else
            {