一：如果在Page_Load中则可以用Response.Redirect("ABC.aspx");
二：在其它事件中可以用以下方法：
protected void Button1_Click(object sender, EventArgs e)
{
Page.Response.RedirectLocation = "/tt.aspx";
PageManager1.AjaxAspnetControls = new string[] { "Page"};
}
{
Page.Response.RedirectLocation = "/tt.aspx";
PageManager1.AjaxAspnetControls = new string[] { "Page"};
}