mono/mcs/class/referencesource/System.Data/System/Data/ParameterDirection.cs

//------------------------------------------------------------------------------
// <copyright file="ParameterDirection.cs" company="Microsoft">
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
// <owner current="true" primary="true">[....]</owner>
// <owner current="true" primary="false">[....]</owner>
//------------------------------------------------------------------------------

namespace System.Data {

    public enum ParameterDirection {

        Input       = 1,

        Output      = 2,

        InputOutput = 3,

        ReturnValue = 6
    }
}