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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.
Is there any reason you have to use a plain text file? As Joshua says this is a poor way to store security information.
In .NET a standard approach is to use an application configuration file to store username/password (eg. app.config or web.config) and encrypt the password using the Data Protectction API (DPAPI) or the System.Security.Cryptography.ProtectedData class.
Jon Galloway provides a decent tutorial on how to do this.