I not develop in NET but I find the VFPToolKit for Net and there is a finction for ADIR(). Here is the code from there:

		/// <summary>
		/// Receives a file skeleton as a parameter and returns an array of files that match the skeleton.
		/// Example:
		/// string[] myArr;
		/// myArr = VFPToolkit.arrays.ADir("c:\\*.*");
		/// </summary>
		/// <param name="cFileSkeleton"></param>
		/// <returns></returns>
		public static string[] ADir(string cFileSkeleton)
		{
			string[] aFiles;
			string lcDrive = VFPToolkit.strings.SubStr(cFileSkeleton, 1,VFPToolkit.strings.RAt("\\", cFileSkeleton));
			string lcStem = VFPToolkit.strings.SubStr(cFileSkeleton, strings.RAt("\\", cFileSkeleton) + 1);
			aFiles = System.IO.Directory.GetFiles(lcDrive, lcStem);
			return aFiles;
		}		

*** UPDATE Please ignore it. I must learn not to put my nose in .... Just after i posted this message I realise that they use the same function. Sorry