public static string getFileExt(string fullFileName)
{
string path = "";
string fileName = "";
int sepPos = 0;
string sep = "";
getPathAndFileName(fullFileName, out path, out fileName);
sepPos = fileName.Length;
if (sepPos == 0)
{
return "";
}
else
{
sepPos -= 1;
sep = fileName.Substring(sepPos, 1);
while (sep != ".")
{
sepPos--;
if (sepPos < 0) break;
sep = fileName.Substring(sepPos, 1);
}
if (sepPos < 0)
{
return "";
}
else
{
return fileName.Substring(sepPos + 1);
}
}
}