asp.net小技巧：页面滚动位置保持

我常用下面的方法：
c#

step 1
replace the tag of <body> with the follewing codes:

<%
if (Request["__SCROLLPOS"] != null &&
      Request["__SCROLLPOS"] != String.Empty) {
      int pos = Convert.ToInt32 (Request["__SCROLLPOS"]);
      Response.Write ("<body id=\"theBody\" " +
          "onscroll=\"javascript:document.forms[0].__SCROLLPOS.value = " +
          "theBody.scrollTop;\" " +
          "onload=\"javascript:theBody.scrollTop=" + pos + ";\">");
}
else {
      Response.Write ("<body id=\"theBody\" " +
          "onscroll=\"javascript:document.forms[0].__SCROLLPOS.value =" +
          "theBody.scrollTop;\">");
}
%>

step 2
add the follewing codes between <form> and </form>

step 1
replace the tag of <body> with the follewing codes:

<%
         If Not Request("__SCROLLPOS") Is Nothing then
         if Request("__SCROLLPOS") <> String.Empty Then
            Dim pos As Integer = CType(Request("__SCROLLPOS"), Integer)
            Response.Write("<body )

        end if
%>

step 2
add the follewing codes between <form> and </form>