Add separator to string at every N characters?

Question

I have a string which contains binary digits. How to separate string after each 8 digit?

Suppose the string is:

string x = \"111111110000000011111111         


        

Answer 1

...or old school:

public static List splitter(string in, out string csv)
{
     if (in.length % 8 != 0) throw new ArgumentException("in");
     var lst = new List(in/8);

     for (int i=0; i < in.length / 8; i++) lst.Add(in.Substring(i*8,8));

     csv = string.Join(",", lst); //This we want in input order (I believe)
     lst.Reverse(); //As we want list in reverse order (I believe)

     return lst;
}