string strPath = Server.MapPath("");

"E:\\Documents and Settings\\Administrator\\My Documents\\Visual Studio 2005\\WebSites\\WebSite10"

 

string strPath = Request.ApplicationPath;

"/WebSite10"

 

string strPath = Server.MapPath(Request.ApplicationPath)

"E:\\Documents and Settings\\Administrator\\My Documents\\Visual Studio 2005\\WebSites\\WebSite10"