asp.net页面刷新问题

·         第一：
private void Button1_Click( object sender, System.EventArgs e )   
{
     Response.Redirect( Request.Url.ToString( ) );
}
第二：
private void Button2_Click( object sender, System.EventArgs e )   
{
     Response.Write( "
     <script language=javascript>window.location.href=document.URL;
     </script>" );
}
第三：
private void Button3_Click( object sender, System.EventArgs e )   
{
     Response.AddHeader( "Refresh","0" );
}
第四：
private void Button6_Click( object sender, System.EventArgs e )   
{
     //好像有些不对？
     //Response.Write( "
     <script language=javascript>window.location.reload( );
     </script>" );
}
第五：(需替换<>)
<script><!--
var limit="3:00"
if ( document.images )
{
     var parselimit=limit.split( ":" )parselimit=parselimit[0]*60+parselimit[1]*1
}
function beginrefresh( )
{
     if ( !document.images )returnif ( parselimit==1 )window.location.reload( )else
     {
         parselimit-=1curmin=Math.floor( parselimit/60 )cursec=parselimit%60if ( curmin!=0 )curtime=curmin+"分"+cursec+"秒后重刷本页！"elsecurtime=cursec+"秒后重刷本页！"window.status=curtimesetTimeout( "beginrefresh( )",1000 )
     }
}
window.onload=beginrefresh//-->   </script><DIV style="Z-INDEX: 102;
LEFT: 408px;
POSITION: absolute;
TOP: 232px" ms_positioning="text2D">
<P><FONT size="3">自动刷新页面</FONT></P>
</DIV>第六：
<meta http-equiv="refresh" content="300;
url=target.