c# - How do I add a comma after the fourth character in a sentence?

Question

I know nothing of C# so I'm hoping somebody here can help. So my question is how would I add a "," after the fourth character in a string. Something like:

Hell,o?

Answer 1

You can use .Insert():

string test = "Hello";
test = test.Insert(4, ",");

You should check if the string is long enough though like so:

if (test.Length > 4) {
     test = test.Insert(4, ",");
}