public bool IsExsitFileName(String TXTFile,String findFileName)
        {
            string strLine;
            StreamReader sr;
            try
            {
                sr = new StreamReader(TXTFile, Encoding.Default);
                while (sr.Peek() > -1)
                {
                    strLine = sr.ReadLine();
                    if (strLine.Equals(findFileName))
                    {
                        sr.Close();
                        return true;
                    }
                }
                sr.Close();
                return false;
            }
            catch (Exception e)
            {
                throw e;
            }
        }