still if you have problem to develop it then download the sample copy of the project from that page given below.

see in bottom of the Developer's API page.


thanks

here
http://gateway4sms.com/

after creating account you will receive a password on your mobile and then you have to login using that username and password.

after login you have to lookup the Developer's API (see left side) and follow the instruction.


thanks

that's very good to create your own....

as you my friend you need to have sms gateway and there are may such providers available, they also use to provide some free trial service. here is some of them

http://gateway4sms.com/

http://www.squidoo.com/2-way-sms-gateway

http://www.indiabulksms.com/

You can follow the instruction given by them to create sms portal.



good luck

there are some article on this community which will help you to solve your problem

http://www.c-sharpcorner.com/UploadFile/diya0076/827/

http://www.c-sharpcorner.com/UploadFile/scottlysle/TextMsgToCellPhone12112006002339AM/TextMsgToCellPhone.aspx



I hope these links will help you lot.