i am developing a application that if i want to send sms from my application to my client mobile.what language i would use presently my application is in vb6 and also in asp

vb6 is gud enough for mobile applications.

What you need to do is an SMS Engine which acts as a mediator between your vb application and Mobile.
Generally all the Cell Operators buy these Engines and use them.

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Many cell providers have e-mail addresses set up for SMS messaging. For instance Sprint uses number@messaging.sprintpcs.com. If you create a program which sends an e-mail based on that form, then your program can send an SMS message.

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