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Editorial Team
Asked: May 15, 20262026-05-15T21:01:58+00:00 2026-05-15T21:01:58+00:00

I have problems inserting a null paramater with the AddInParameter method. cmd.AddInParameter(someString, someValueWhichCanBeNULL) As

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I have problems inserting a null paramater with the AddInParameter method.

cmd.AddInParameter(someString, someValueWhichCanBeNULL)

As soon as the 2nd param is null, it fails. I also Tried DBNull.Value, fails too. Ideas?

The message is: AddInParameter @MyParam with null value or Unsupported Property Type: DBNull

Thanks!

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  1. Editorial Team
    Editorial Team
    2026-05-15T21:01:58+00:00Added an answer on May 15, 2026 at 9:01 pm

    Use the overload of AddInParameter that takes three arguments; you want this:

    cmd.AddInParameter(someString, DbType.String, someValueWhichCanBeNULL);
    

    (It can’t determine the type of the parameter from the DBNull.Value alone)

    Hope that helps!

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