Adding DuplicateLayerException to the VS2008 project
Adding DuplicateLayerException to the VS2008 project

git-tfs-id: [https://tfs.codeplex.com/tfs/TFS01]$/SharpMap/Trunk;C26076

nhvu1988/SharpMap,SharpMap/SharpMap,nhvu1988/SharpMap,SharpMap/SharpMap