My ini file does not have any section. It has following data
private static extern int GetPrivateProfileString(string section,
string key,string def, StringBuilder retVal,
int size,string filePath);
Here's a library that the author says supports section-less keys. I myself have not tried this library.
Or, you could simply edit the Ini file and add in a "header"/section name right at the top, then delete it once you're done reading.