Get Second to last character position from string

Question

I have a dynamically formed string like - part1.abc.part2.abc.part3.abc

In this string I want to know position of second to last \".\" so that i can split string as

Answer 1

Here is another solution:

         string aString = "part1.abc.part2.abc.part3.abc";
        // Getting string until last dot
        var untilLastDot = aString.Substring(0, aString.LastIndexOf("."));
        // Now we have string until last dot and last dot here will be last but one 
        // and getting text from last but one dot to end
        string lastWordButOne = aString.Substring(untilLastDot.LastIndexOf(".") + 1);
        // Result: part3.abc

hope helps, Thanks!