String.Replace ignoring case

by

You could use a Regex and perform a case insensitive replace:

class Program
{
    static void Main()
    {
        string input = "hello WoRlD";
        string result = 
           Regex.Replace(input, "world", "csharp", RegexOptions.IgnoreCase);
        Console.WriteLine(result); // prints "hello csharp"
    }
}

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