Find Out The Length Of Filename By Validation

I'm working with a file upload form and want to evaluate the length of the filename and if it's greater than 12, cut it off as such:Code:

StrFileName = Form("SourceFile").FileName <--show the whole name if its less than 12, or

StrFileName = LEFT(Form("SourceFile").FileName ,10) & "..." <--cut it off after 10.

I don't know how to evaluate the form input length and do the if then's based on it, though.

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