C#

Rick_Bishop wrote:

They aren't read only

using System;
using System.IO;

public static class Globals
{
    public const Int32 MaxFormWidth = 1000;

    public static String SerializeFileName { set; get; } = @"Data.xml";

    static readonly String SerializeFolderPath = @"MyAppSavedData";

    public static string GetSerializeFilePath(string filename = "")
    {
        if (filename != "" && SerializeFileName != filename)
        {
            SerializeFileName = filename;
        }

        string path = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);

        path = Path.Combine(path, SerializeFolderPath, SerializeFileName);

        if(IsValidPath(path)) return path;

        throw new FileLoadException($"{path} is not a valid file path");
    }

    static bool IsValidPath(string path)
    {
        // code omitted
    }
}

public static String SerializeFileName { set; get; } = @"Data.xml";