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How to count number of characters in a textbox?

Posted By: Posted Date: September 18, 2010 Points: 0 Category :ASP.Net

On my current form I have it validating a Canadian Postal Address (xxx xxx). The space is optional but if the user does not use a space, then once the validation passes it will insert one. How can I count the first 3 characters of the textbox, insert a space, then add the rest of the characters?Thank you

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