ya found solution here link here i have to include this code for chrome
protected void Page_PreInit(object sender, EventArgs e)
{
if (!IsPostBack)
{
if ((Request.UserAgent.IndexOf("AppleWebKit") > 0) || (Request.UserAgent.IndexOf("Unknown") > 0) || (Request.UserAgent.IndexOf("Chrome") > 0))
{
Request.Browser.Adapters.Clear();
}
}
}
and For IE8 there is a special hotfix for ASP.NET 2.0. Here is it: http://support.microsoft.com/kb/962351