ASP.NET动态创建控件和回发

UserControl userControl = (UserControl)Page.LoadControl("~/MyUserControl.ascx");
PlaceHolder1.Controls.Add(userControl);

ControlBuilder controlBuilder = new ControlBuilder(typeof(Button));
Button button = (Button)controlBuilder.BuildObject();
button.Text = "Click me!";
button.Click += new EventHandler(Button_Click);
PlaceHolder1.Controls.Add(button);

HtmlGenericControl div = new HtmlGenericControl("div");
div.InnerText = "Hello, world!";
PlaceHolder1.Controls.Add(div);

ViewState["MyData"] = "Hello, world!";

Session["MyData"] = "Hello, world!";

Button1.Click += new EventHandler(Button1_Click);

private void Button1_Click(object sender, EventArgs e)
{
    // 处理回发事件
}

if (IsPostBack)
{
    // 处理回发事件
}