How to mask a string

For a credit card need to throw a message box   masking the card number and only showing the last 4 digits.

Any Suggestion?
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Russ SuterSenior Software DeveloperCommented:
I've solved this problem a couple of ways in the past. One approach would be to create a class and override the ToString() method to return only the last 4 digits.

You may also need extra logic to test whether or not the number is a valid credit card number. Those rules vary depending on card brand but can be found with a little Googling.

Another approach if you don't really care about first verifying that what you're about to mask is actually a credit card number is to create an extension method that does the masking for you. This might not be an option for you since your question is tagged as both Visual Basic Classic and Visual Basic.NET. What platform are you actually using?
RIASAuthor Commented:
I am using 2005 windows version.I have found a solution for valid card number,just need to masking the number and pop up last 4 digits
Can you just replace the first 12 digits with X's?

As in:
Imports System
Public Module Module1
	Public Sub Main()
		dim cc as string = "1234567890123456"
		dim show as string = "xxxxxxxxxxxx" & cc.Substring(12,4)
		Console.WriteLine("Your card is " & show)
	End Sub
End Module

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