private static void IOHelperTest()
{
Stream stream = IOHelper.FileToStream(@"E:\allTravelConsultant.txt");
IOHelper.StreamToFile(stream, @"E:\test.txt");
byte[] bytes = IOHelper.ConvertStreamToBytes(stream);
string base64Str = IOHelper.ConvertBytesToBase64Str(bytes);
IOHelper.WriteContentIntoTxt(new List <string> {
base64Str
}, @"E:\test.txt", false);
List <string> res = IOHelper.ReadContentFromTxt(@"E:\test.txt");
}