c# browser check

HttpBrowserCapabilities brow;

brow = HttpContext.Current.Request.Browser;

public browser()
{

if (brow.Browser == "IE")
{

if (brow.MajorVersion >= 8)

{

            }

 else if (brow.MajorVersion == 7)

            {
                s = brow.MajorVersion.ToString();
             }
             else if (brow.MajorVersion <= 6)
             {
                s = brow.MajorVersion.ToString();
             }
}

else if (brow.Browser == "Firefox")

{

if (brow.MajorVersion >= 3)

            {
                s = brow.MajorVersion.ToString();
             }
   
}

}