How do I get the last four characters from a string in C#?

Question

Suppose I have a string:

\"34234234d124\"

I want to get the last four characters of this string which is \"d124\". I can use <

Answer 1

assuming you wanted the strings in between a string which is located 10 characters from the last character and you need only 3 characters.

Let's say StreamSelected = "rtsp://72.142.0.230:80/SMIL-CHAN-273/4CIF-273.stream"

In the above, I need to extract the "273" that I will use in database query

        //find the length of the string            
        int streamLen=StreamSelected.Length;

        //now remove all characters except the last 10 characters
        string streamLessTen = StreamSelected.Remove(0,(streamLen - 10));   

        //extract the 3 characters using substring starting from index 0
        //show Result is a TextBox (txtStreamSubs) with 
        txtStreamSubs.Text = streamLessTen.Substring(0, 3);