How to validate textboxes (C#)?

I am writing a program with a main form, when the user clicks on one of the menu buttons it will pop up another form. This form will have textboxes, I want to make sure all the textboxes have been filled out and that they contain the correct info (Most will require letters A-Z only but a few will be numbers 0-9 only). I do not want to use an error provider, I want to make it so when they click Ok if the textboxes aren't all as they should be it will show a messagebox saying what the error is (Either blank, or improper input in whatever textbox has the wrong input). I have no idea how to do this, all I can find are extremely technical explanations that don't help me. I know there's a validated and validating event but I don't have a clue how that works or what to do with it. Can anyone explain this to me? I don't feel like this is that complicated but I'm having a hard time finding an explanation that isn't overly technical.
Answer:

error provider needs validated and validating event to works. so the choices are by using them together, or manually validate all the textbox one by one..

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Other answers

You can use masked textbox. It is really easy to use and it can control what ever data u want the textbox to get! In this way u can't show message box as it doesn't accept the other characters But u can have a simple check on input with ascii codes. If it's a-z upper and lower case and 0-9 it means: 65-90 A-Z 97-122 a-z 48-57 0-9 for getting the ascii code: System.Text.ASCIIEncoding if not u can show a message box.

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