Question

I’m creating a notepad program in C# winforms. Please suggest me some ideas regarding how can i perform replace/replace all operation.

Answer 1

Console.WriteLine("TEXT".Replace("EX","XE"));

reworked:

var s="TEXT";
Console.WriteLine(s.Replace("EX","XE"));

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Simple implementation of question in comments:

        Console.WriteLine("TEXT".IndexOf("EX"));
        var s="TEXT";
        var f = "EX";
        var r = "XE";
        var i = s.IndexOf(f);
        s=s.Remove(s.IndexOf(f), f.Length);
        s = s.Insert(i, r);
        Console.WriteLine(s);

to replace backward using simple extension methods, invert the above and use .Reverse();

note that .IndexOf(f) has a start value .IndexOf(f,start) that can be used for stepping.