How to get free space of shared folder path in c#?

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C#2.0

C#

How do I get free space of shared folder path in c#?

I am able to get the folder size via below code. But I want to get the free space.

{
    foreach (string file in Directory.GetFiles(SharedServerDBBackUpPath))
    {
        if (File.Exists(file))
        {
            FileInfo finfo = new FileInfo(file);
            folderSize += finfo.Length;
        }
    }
}
catch (NotSupportedException e)
{
    Console.WriteLine("Unable to calculate folder size: {0}", e.Message);
}