Handling auto-complete search on server side?

[DH]

I'm having some trouble understanding how the datasource calls are handled on the server side. 

In this scenario i'd like to have the search box only request after either 3 letters are entered, or if the search button is pressed. I'm binding to my own datasource connecting to a BI layer. I don't quite understand how the onSearch event is fired both if the search is pressed, or if data changes in the box. What is the difference then when a user actually selects an item from the list? 

A code example would be helpful.

[Dimitar Terziev]

Hello,

In order to define a minimum set of characters to be entered before a request of items is initiated the MinFilterLength property should be set. Regarding the OnSearch event more information could be found in the following help article from our online documentation.

Regards,
Dimitar Terziev
Telerik