Ajax

Question

Hi frnds..can u anybody  know about AJAX and its implementation...

is there any directive to ajax like jquery (src="jquery.1.23.ui.cs")..?

i copied from telerik.ui.ajax..but it shows

 UNKNOWN SERVER TAG "telerik:RADSCRIPTMANAGER"

 

 

 

plz tell me....

 

 

Thank you,

Pavan .