ADO.net with MS Access query containing a module function

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C#

ADO.NET

MS-Access

I have created an MS Access Query named GetContactCategory

select GetCategoryNames(contactId) as CategoryNames from Contacts

The Function GetCategoryNames is the function written in a module of same database.

Now when i call this query in my c# application using ADO.net it throws error.

Following is my c# code

using (OleDbCommand cm = new OleDbCommand())
            {
                cm.Connection = AccessConnection();
                cm.CommandType = CommandType.StoredProcedure;
                cm.CommandText = "GetContactCategory";

                cm.Connection.Open();
                using (OleDbDataReader reader = cm.ExecuteReader())//This line throws error
                {
                    //some code
                }
           }

The error which is get Undefined function 'GetCategoryNames' in expression.

what is the problem and whats the solution.