Get information about current Windows theme in C#

ThemeInfo.cs

public class ThemeInfo
{
    private readonly string _themeName;
    private readonly string _themeColor;
    private readonly string _themeSize;
    private readonly string _themeFileName;

    public ThemeInfo(string name, string fileName, string color, string size)
    {
        _themeName = name;
        _themeFileName = fileName;
        _themeColor = color;
        _themeSize = size;
    }

    public string ThemeFileName
    {
        get { return _themeFileName; }
    }

    public string ThemeName
    {
        get { return _themeName; }
    }

    public string ThemeColor
    {
        get { return _themeColor; }
    }

    public string ThemeSize
    {
        get { return _themeSize; }
    }
    
    public static ThemeInfo Current
    {
        get
        {
            var fileName = new StringBuilder(260);
            var color = new StringBuilder(260);
            var size = new StringBuilder(260);
            int hresult = GetCurrentThemeName(fileName, fileName.Capacity, color, color.Capacity, size, size.Capacity);
            if (hresult < 0)
                throw Marshal.GetExceptionForHR(hresult);
            string themeName = Path.GetFileNameWithoutExtension(fileName.ToString());
            return new ThemeInfo(themeName, fileName.ToString(), color.ToString(), size.ToString());
        }
    }
    
    [DllImport("uxtheme", CharSet = CharSet.Auto)]
    private static extern int GetCurrentThemeName(
    StringBuilder pszThemeFileName,
    int dwMaxNameChars,
    StringBuilder pszColorBuff,
    int cchMaxColorChars,
    StringBuilder pszSizeBuff,
    int cchMaxSizeChars
    );
}

Exception! When current Classic Windows Theme! (windows 7 sp1 x64)

ThemeColor is "NormalColor" .. what would you do with that? It's useless