How to specify the working folder in sharpshell

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C#6.0

iam using sharpshell but iam confused that how can i specify the path
for files for icon overlay

.NET Shell Extensions - Shell Icon Overlay Handlers[^]

What I have tried:

protected override bool CanShowOverlay(string path, SharpShell.Interop.FILE_ATTRIBUTE attributes)
{
try
{

File.WriteAllLines(@"C:\Abc.txt",new string[]{path});
// Get the file attributes.
var fileAttributes = new FileInfo(path);

// Return true if the file is read only, meaning we'll show the overlay.
return fileAttributes.IsReadOnly;
}
catch (Exception)
{
return false;
}
}