private string title(string pth) //I'm passing a path
{
    pth = System.IO.Path.GetFileNameWithoutExtension(pth); // I need an exact filename with no extension
    return pth.Substring(pth.IndexOf('-')+1, pth.Length).Trim(); // trying to return everything after '-'
}

return pth.Substring(pth.IndexOf('-')+1, pth.Length).Trim();

return pth.Substring(pth.IndexOf('-')+1).Trim();

private string title(string pth) //I'm passing a path
    {
        pth = System.IO.Path.GetFileNameWithoutExtension(pth); // I need an exact filename with no extension
        string retStr = string.Empty;
        if(pth.IndexOf('-')<pth.Length-1)
        {
              retStr = pth.Substring(pth.IndexOf('-')+1).Trim(); // trying to return everything after '-'
        }
        return retStr;
    }

private static string title(string pth)
{
   pth = System.IO.Path.GetFileNameWithoutExtension(pth); // I need an exact filename with no extension
   Match m = Regex.Match(pth, @".*-(?<suffix>.*)$");

   Group suffix = m.Groups["suffix"];
   return suffix.Success ? suffix.Value : pth;
}

int index = pth.IndexOf('-');
return pth.Substring(index + 1, pth.Length - index - 1);

if(pth.IndexOf('-') != -1)
{
    //Substring code
}

pth.Substring(pth.IndexOf('-')+1, pth.Length)

pth.Substring(pth.IndexOf('-')+1)

private string title(string pth) //I'm passing a path
{
    pth = System.IO.Path.GetFileNameWithoutExtension(pth);
    return pth.Substring(pth.IndexOf('-')+1, pth.Length - pth.IndexOf('-') - 1).Trim();
}

private string title(string pth) //I'm passing a path
{
  pth = System.IO.Path.GetFileNameWithoutExtension(pth);
  var indexOfDash = pth.IndexOf('-') + 1; // Add this line
  return pth.Substring(indexOfDash, pth.Length - indexOfDash).Trim();
}