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how can i send a rfid_no. from lpc2148 to VISUAL BASICS (To search in database) using uart(serial communication).
Probably the same way you'd send any serial data from the micro-processor, and the same way you'd open a COM port in your selected application framework.
What parts of your project do have you any experience with?
Perhaps you should look for VB applications that talk to modems or other serial devices, and look for NXP code that outputs to a terminal, GPS receiver or modem. Break the tasks into small enough steps you can solve, and adapt.
Your teacher? Your fellow students?