FileDirChecker.cs

public class FileDirChecker 
{
    public bool isDirectory(string path) 
    { 
        bool ret = false; 
        // get the file attributes for file or directory
        FileAttributes attr = File.GetAttributes(path);

        if (attr.HasFlag(FileAttributes.Directory))
            ret = true;  
        else
            ret = false; 
    }
}