visual basic program to manipulate text

Would someone be able to write me the code to do the following? I am a
complete novice so would appreciate simplicity and explaination where
appropriate.

I have to produce a visual basic program to manipulate text using a
menu:

A user will be able to type in some text and choose one of the
following options from a menu:

1)change to upper case
2)change to lower case
3)count the letters

The results of each action should be displayed appropriately.

If anyone can spare me the time it would really be appreciated, Thanks.

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