to display weeknumber in AJAX calender

Question

 I have one issue in AJAX calender.We developed one asp.net application using vb.net and AJAX.In this application we are using AJAX toolkit, that mean the calender control is "Calender Extender".Here what i want, i need to add one more column in this AJAX calender,that is called weeknumber.

How to possible this,i tried somany ways,but not able to do that.

But i can able to this using ASP or VB.net or C#.net.