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ASP.Net/C# - I want to replace everything but the last 4 characters of a string to "*".

Posted on 2008-06-23
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Last Modified: 2013-12-16
Hello all.  I need to take a value such as SSN and replace all the values of the string other than the last 4 numbers.  For example, 111111111 to *****1111.  Then I need to also keep the actual value though for an update.  Any ideas?
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Question by:sbornstein2
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Expert Comment

by:Bob Learned
ID: 21854141
Are you wanting to change the value for display?
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by:sbornstein2
ID: 21856727
Learned one that is correct I want to change the value of the SSN where it shows just the last 4 digits but then I do need to still have the actual value itself to store on an update.  The page is SSL but they want this.
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LVL 96

Expert Comment

by:Bob Learned
ID: 21856756
How are you displaying the SSN on the page?
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Author Comment

by:sbornstein2
ID: 21860197
right now it comes back in free text via a web service call.  I need to take that value and mask it and then display it.
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Bob Learned earned 1000 total points
ID: 21861570
Do you want to do something like this?

            string ssn = "123-45-6789";

            this.txtSSN.Text = new string('*', ssn.Length - 4) + ssn.Substring(ssn.Length - 4);
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