Filtering file names: getting *.abc without *.abcd, or *.abcde, and so on

*

  "*.abc" returns files having an extension of .abc, .abcd, .abcde, .abcdef, and so on.
*

  "*.abcd" returns only files having an extension of .abcd.
*

  "*.abcde" returns only files having an extension of .abcde.
*

  "*.abcdef" returns only files having an extension of .abcdef.

private bool StriktMatch(string fileExtension, string searchPattern)
    {
        bool isStriktMatch = false;

        string extension = searchPattern.Substring(searchPattern.LastIndexOf('.'));

        if (String.IsNullOrEmpty(extension))
        {
            isStriktMatch = true;
        }
        else if (extension.IndexOfAny(new char[] { '*', '?' }) != -1)
        {
            isStriktMatch = true;
        }
        else if (String.Compare(fileExtension, extension, true) == 0)
        {
            isStriktMatch = true;
        }
        else
        {
            isStriktMatch = false;
        }

        return isStriktMatch;
    }

class Program
{
    static void Main(string[] args)
    {
        string[] fileNames = Directory.GetFiles("C:\document", "*.abc");

        ArrayList al = new ArrayList();

        for (int i = 0; i < fileNames.Length; i++)
        {
            FileInfo file = new FileInfo(fileNames[i]);
            if (StriktMatch(file.Extension, "*.abc"))
            {
                al.Add(fileNames[i]);
            }
        }

        fileNames = (String[])al.ToArray(typeof(String));

        foreach (string s in fileNames)
        {
            Console.WriteLine(s);
        }

        Console.Read();
    }

List<string> fileNames = new List<string>();
// populate all filenames here with a Directory.GetFiles or whatever

string srcDir = "from"; // set this
string destDir = "to"; // set this too

// this filters the names in the list to just those that end with ".doc"
foreach (var f in fileNames.All(f => f.ToLower().EndsWith(".doc")))
{
    try
    {
        File.Copy(Path.Combine(srcDir, f), Path.Combine(destDir, f));
    }
    catch { ... }
}

string strSomePath = "c:\SomeFolder";
string strSomePattern = "*.abc";
string[] filez = Directory.GetFiles(strSomePath, strSomePattern);

var filtrd = from f in filez
	     where f.EndsWith( strSomePattern )
	     select f;

foreach (string strSomeFileName in filtrd)
{
	Console.WriteLine( strSomeFileName );
}

string[] fileList = Directory.GetFiles(path, "*.abc");

foreach (string file in fileList)
{
   FileInfo fInfo = new FileInfo(file);

   if (fInfo.Extension.Length == 4) // "." is counted in the length
   {
      // exact extension match - process the file...
   }
}