String.Replace ignoring case

Question

I have a string called \"hello world\"

I need to replace the word \"world\" to \"csharp\"

for this I use:

string.Replace(\"World\", \"csharp\         


        

Answer 1

Doesn't this work: I cant imaging anything else being much quicker or easier.

public static class ExtensionMethodsString
{
    public static string Replace(this String thisString, string oldValue, string newValue, StringComparison stringComparison)
    {
        string working = thisString;
        int index = working.IndexOf(oldValue, stringComparison);
        while (index != -1)
        {
            working = working.Remove(index, oldValue.Length);
            working = working.Insert(index, newValue);
            index = index + newValue.Length;
            index = working.IndexOf(oldValue, index, stringComparison);
        }
        return working;
    }
}