visual studio limit (string) argument to a selection

I setup a sub to perform an action, and I only want to proceed if the argument is "optionA" or "optionB".
I have an if block to determine the direction of the code, but was curious if there was a way to define specific argument items, more for use with intellisense so that as I call that sub, I can quickly tab complete one of the two options.
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sirbountyAsked:
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David Johnson, CD, MVPOwnerCommented:
no you're doing it the right way..
AndyAinscowFreelance programmer / ConsultantCommented:
>>but was curious if there was a way to define specific argument items, more for use with intellisense so that as I call that sub

You could use enum values and use those as the arguments.  The sub can then only accept that type (your enum constants) as arguments.

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sirbountyAuthor Commented:
Ah yes, an enum should help.  Thanks
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