DbNull.Value Stored Procedure Parameter?

Using dtResult as New DataTable
  Using cn as SqlConnection = New SqlConnection ("ConnectionString")
    Using sqlcmd as SqlCommand - New SqlCommand("StoredProceName", cn) with {.CommandType=CommandType.StoredProcedure}

      Dim sp As SqlParameter
      sp = sqlcmd.Parameters.Add("@Count", SqlDbType.Int)
      sp.value = CType(Nothing, SqlTypes.SqlInt32)

      Using myDR as SqlDataReader = sqlcmd.ExecuteReader
        dtResult.Load(myDR)
      end using
      return dtResult
    End Using ' For sqlcmd
    cn.Close() ' Close the connection
  end using ' For cn
end using ' For dtResult