This article discribes how we can extend textbox control with validation properites like Numckeck, Charcheck etc, you will come to know how 3rd party control are developed, you will feel good to use the control which encapsulate all validation codes.

A GridView displaying records with a DropDownList as a field and updating a database with an ObjectDataSource. A problem occurs if the dropdown's selected value can not be passed as a parameter. The issue is solved here in this article by programatically adding an update parameter in the code-behind

Serail Communication in .Net connecting GSM Modem

SMS Client - Server Software is used for sending, reading, deleting messages. It uses GSM modem for sending SMS. It listens for incoming messages to arrive, processes the read message and takes action accordingly. This SMS software requires GSMComm Library which you can also download.

Control your system by shutting down, rebooting, log-off, hibernate

Artical describes CRC Calculation for Modbus Protocol