Question

How could I using a simple gui consisting of a button, listbox and textbox , list all the finite sequences of a given string?. For example, list all the finite sequences of the string abcde?

Answer 1

I belive you can find all code here:
Permutations, Combinations, and Variations using C# Generics
Permutations in C# Using Recursion

And its quite simple when it comes to UI:

 this.listBox1.Items.Add(YourFunction(this.textBox1.Text));