How do I Send SMS to Active Directory Users

How do I send an SMS to Active Directory Users. I want to design a small application (in C#) for my telecom operator client that will send various SMS based notifications to their (AD) users by using their SMS gateway.

From stackoverflow

• I'm assuming you mean that the mobile number is stored in AD & you wish to pull this number out with a query and use the API provided by your SMS gateway to send a message?
  You may want to look at this code sample. You can query AD with System.DirectoryServices. Finding the mobile phone number attribute in the AD schema may be a little easier with AD Explorer Hope this helps.