how to validate usename and password from a text file form

Posted by Ani on Stack Overflow See other posts from Stack Overflow or by Ani
Published on 2010-04-15T00:55:47Z Indexed on 2010/04/15 1:23 UTC
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I have a login form that has Username and password as inputs from user and I want to validate these login credentials from a text file. How can I do it? I know how to write data and read data..but how to read only specific data.or check whether username password combination exists or not.

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