Remove file extension from a file name string

Question

If I have a string saying \"abc.txt\", is there a quick way to get a substring that is just \"abc\"?

I can\'t do an fileName.IndexOf(

Answer 1

    /// 

    /// Get the extension from the given filename
    /// 
    /// the given filename ie:abc.123.txt
    /// the extension ie:txt
    public static string GetFileExtension(this string fileName)
    {
        string ext = string.Empty;
        int fileExtPos = fileName.LastIndexOf(".", StringComparison.Ordinal);
        if (fileExtPos >= 0)
            ext = fileName.Substring(fileExtPos, fileName.Length - fileExtPos);

        return ext;
    }