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Editorial Team
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Asked: 2026-06-15T19:31:46+00:00

I thought that bill + john + null == billjohn , but in this

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I thought that "bill" + "john" + null == billjohn, but in this example of mine it seems to be evaluating to null: 

 var clients = from client in taxPortalService.Client()
                          select new ClientViewModel
                              {                               
                                  ResidentialAddressLine1 = client.RESADDRESSLINE1,
                                  ResidentialAddressLine2 = client.RESADDRESSLINE2,
                                  ResidentialAddressLine3 = client.RESADDRESSLINE3,
                                  ResidentialAddressLine4 = client.RESADDRESSLINE4,
                                  ResidentialPostalCode = client.RESPOSTCODE,
                                  ResidentialCountry = client.RESCOUNTRY,
                                  IAResidentialAddress = client.RESADDRESSLINE1 + ", " + client.RESADDRESSLINE2 + ", " + client.RESADDRESSLINE3 + ", " + client.RESADDRESSLINE4 + ", " + client.RESPOSTCODE + ", " + client.RESCOUNTRY                               
                              };

Am I missing something obvious here?

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1 Answer

  1. Editorial Team

    In C#, or rather in .NET, you’re right, "bill" + "john" + null gives you "billjohn".

    In SQL, 'bill' + 'john' + null gives you null.

    Using LINQ to Entities translates your C# to SQL, and subtle differences such as this aren’t always preserved.

    You can use the more verbose

    (client.RESADDRESSLINE1 ?? "") + ", " + (client.RESADDRESSLINE2 ?? "") + ", " + ...

    to make sure you only concatenate non-null strings, which won’t have this problem.

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