mono/netcore/System.Private.CoreLib/shared/System/IO/FileAccess.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;

namespace System.IO
{
    // Contains constants for specifying the access you want for a file.
    // You can have Read, Write or ReadWrite access.
    // 
    [Flags]
    public enum FileAccess
    {
        // Specifies read access to the file. Data can be read from the file and
        // the file pointer can be moved. Combine with WRITE for read-write access.
        Read = 1,

        // Specifies write access to the file. Data can be written to the file and
        // the file pointer can be moved. Combine with READ for read-write access.
        Write = 2,

        // Specifies read and write access to the file. Data can be written to the
        // file and the file pointer can be moved. Data can also be read from the 
        // file.
        ReadWrite = 3,
    }
}