Report error code when deleting file fails.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5852 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Util/NativeMethods.cs

@@ -94,7 +94,7 @@ namespace ICSharpCode.SharpDevelop
 			info.pFrom = fileName + "\0"; // pFrom is double-null-terminated
 			int result = SHFileOperation(ref info);
 			if (result != 0)
-				throw new IOException("Could not delete file " + fileName + ". Error " + result);
+				throw new IOException("Could not delete file " + fileName + ". Error " + result, result);
 		}
 		#endregion