I need help solving this assignment

Below are the directions to the assignment

The code must be done in the C# programming language, and must be EXTREAMLY easy/ basic as I am very new to programming

Program must be a GUI (Graphic User Interface)

You help would be much appreciated.

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Directions

(based on Deitel 9.4)

(Duplicate Word Removal). This time you need to remove duplicate words not numbers Write a WinForm app that inputs a sentence from the user (assume no punctuation), then determines and displays the non-duplicate words in alphabetical(!) order. Treat uppercase and lowercase letters the same. [Hint: You can use string method Split with no arguments, as in sentence.Split(), to break a sentence into an array of strings containing the individual words. By default, Split uses spaces as delimiters. Use string method ToLower.

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Thank you so much for all of your help!