File: src\libraries\Common\src\System\NotImplemented.cs
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Project: src\src\coreclr\System.Private.CoreLib\System.Private.CoreLib.csproj (System.Private.CoreLib)
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace System
{
    //
    // Support for tooling-friendly NotImplementedExceptions.
    //
    internal static class NotImplemented
    {
        /// <summary>
        /// Permanent NotImplementedException with no message shown to user.
        /// </summary>
        internal static Exception ByDesign => new NotImplementedException();
 
        /// <summary>
        /// Permanent NotImplementedException with localized message shown to user.
        /// </summary>
        internal static Exception ByDesignWithMessage(string message)
        {
            return new NotImplementedException(message);
        }
    }
}