System.InvalidCastException when Stored Procedure out parameters are null
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                 Key: IBATISNET-239
                 URL: https://issues.apache.org/jira/browse/IBATISNET-239
             Project: iBatis for .NET
          Issue Type: Bug
          Components: DataMapper
    Affects Versions: DataMapper 1.6.1
         Environment: All
            Reporter: Oikonomopoulos Spyros


When a stored procedure with out parameters returns a null value in one of the 
parameters, the following Exception occurs:

IBatisNet.Common.Exceptions.ProbeException : Unable to cast object of type 
'System.DBNull' to type XXXX

See also http://www.nabble.com/output-parameters-and-dbnull-p9643387.html

Attached a patch that seems to solve the problem.

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