"message": "Exception of type '' was thrown.", In the cases above, you must put the "Is it null?" case first, so it doesn't go on to check the other cases (and error) when the string is null."message": " InstallTask failure a213b767-5557-4426-8c90-f32f7da51a26 ModpackInstallTask", Is not the empty string ( String.Empty / "").In your example you want to make sure your string has a value, which means you want to ensure the string: before you do strSearch.SomeMethod() or strSearch.SomeProperty you need to check that strSearch != null. You need to ensure strSearch (or any variable for that matter) is not null before you dereference it using the dot character (. Indicates whether the specified string is Nothing or an Empty string. Which means you still need to check for your "IsWhiteSpace" case with the. The String.IsNullOrEmpty method used above is equivalent to: if (strSearch = null || strSearch = String.Empty) In earlier versions, you could do something like this: if (String.IsNullOrEmpty(strSearch) || strSearch.Trim().Length = 0) Indicates whether a specified string is Nothing, empty, or consists The String.IsNullOrWhiteSpace method used above is equivalent to: if (strSearch = null || strSearch = String.Empty || strSearch.Trim().Length = 0) NET 4.0 is: if (String.IsNullOrWhiteSpace(strSearch))
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