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Old May 2nd, 2006, 05:54 PM
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Default passing a null value thru sql parameter

Hi There,

My latest problem is passing a null value to a stored procedure thru a VB .NET class. The date column in the sql server table can take a null. The procedure works fine when running thru a sql query window in sql server (ie exec procname <i>par_list</i>).

The problem is when calling the proc thru vb code, I get an error when passing a null value after declaring the parameter to be a datetime.

The code below generates an error for cmd.ExecuteNonQuery() if prmDOB is a null value or nothing. It works fine if there is an actual date, but the table can hold a null and I would like to keep it that way.

Dim prmDOB As SqlParameter = New SqlParameter("@DOB", SqlDbType.DateTime)

        prmDOB.IsNullable = True
        prmDOB.Direction = ParameterDirection.Input
        prmDOB.Value = DOB


Thanks for listening and the prior help.


Paul O

Old May 3rd, 2006, 12:56 AM
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Hi Paul,

You need to pass DBNull.Value instead:

If DOB IsNot Nothing Then
   prmDOB.Value = DOB
   prmDOB.Value = DBNull.Value
End If


Imar Spaanjaars
Everyone is unique, except for me.
Author of ASP.NET 2.0 Instant Results and Beginning Dreamweaver MX / MX 2004

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