How to write C# Code to Send and receive message through HSDPA Dongle?

Currently i am working on a library management project, on this project i need to send overdue details of books to the user via a sms message using HS-DPA Dongle ( HUAWEI 1750).
Please someone help me to write the code..

it appears that when you install the dongle that it will install a virtual serial port. Through this port you access it like any modem, with AT commands. The specific commands don't seem to be readily available online, but maybe the documentation or your provider will have them. This article looks like it will have info you can use.