Using Server.MapPath("..") in ASP.NET 2.0 will result in the below error:
System.InvalidOperationException: "Failed to map the path '/'"
This might come as a surprise to ASP.Net 1.x programmers as Server.MapPath("..") works fine in the older versions. The newer version does not support ".." and it is recommended to use "~" instead. For e.g.:
Server.MapPath("~/Folder1");