C#

Error in DirectoryInfo. Error: System.IO.DirectoryNotFoundException: Could not find a part of the path 'Z:\Tom\import\TxtFiles\Sub1'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption)
   at System.IO.DirectoryInfo.GetFiles(String searchPattern, SearchOption searchOption)
   at System.IO.DirectoryInfo.GetFiles(String searchPattern)
   at DocumentShuttleService.Service1.DirectoryInfo(String sPath, String sFileSearch)

public Boolean DirectoryInfo(string sPath, string sFileSearch)
{
    try
    {
        Boolean bolFoundAMatch = false;

        if (sPath != string.Empty)
        {
            DirectoryInfo di = new DirectoryInfo(sPath);
            FileInfo[] rgFiles = di.GetFiles(sFileSearch);

            foreach (FileInfo fi in rgFiles)
            {
                bolFoundAMatch = true;
            }

            if (bolFoundAMatch)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        else
        {
            return false;
        }
    }
    catch (Exception ex)
    {
        sErrorMessage = "Error in DirectoryInfo. Error: " + ex.GetBaseException().ToString();
        sRetStatusErrorLog = WriteInLog(sErrorMessage);
        return false;
    }
    finally
    {
    }
}