hi guys,
I need the code for a server client registration form.The server must ask for authentication .Then the client would send in data. This is stored in a file .The server sends back a receipt to the client as part of the payment done.

plz can some 1 get me the code of this.............its urgent!!!

You need to read up on secure communications and cryptography. Check out gnutls for a nice framework for your app with plenty of examples.
GNU TLS Library - GNU Project - Free Software Foundation (FSF)

The code need not be sufficient. There is no prob even if there is security problem during attention. we will see to that. All i need is a code that works.
please guys reply fast

If you had more detailed requirements, maybe somebody would be willing to help you more. Writing code for you based on guesswork is nobody's idea of fun. Did you check out ramen_noodle's link? Did you notice it has plenty of examples?

A server must contain a file with some user names and passwords along with other variables for demand-draft no. and amount paid. A client is a student who gives user name and password. After checking both the server should prompt for status or edit. When asked for status we need to display the amount paid. If asked for edit we need to ask client for DD no. and amount that dd constitutes. finally edit the file and send back the details to client.
The file should around five accounts. All these must be stored in columns separated by tab. Many clients can login at the same time.

You mean on a web site? Or should this be a custom application? With a GUI, or just text-based?

What's a DD?

What i need is a simple c program executed with the help of sockets and file handling.
A dd is demand draft. consider it as a number an integer which is stored. It is just an integer which is used like the credit card number.