How do I replace a substring that appears more than once in a string using a while loop?

Question

I have a string that contains the same two substrings that I need to find and replace.

I used the Contains() method which works fine if there is only one occurrence of the substring.

string test = "abc";

if (line.Contains(test))
{
    string newLine = line;

    while (line.Contains(test))
    { 
        newLine = newLine.Replace(test, "Hello");
    }
}

I basically need something that can break me out of the loop. Such as nextMatch in regex.

Answer 1

Unless I have misunderstood, you are trying to replace all instances of test in line? Just do this:

line = line.Replace(test, "Hello")

no while or loop needed.