Auto Suggest in ASP.NET textbox : To and CC email functionality

I want to create functionality for "To and CC" textboxes used in sending email.

When I type any name in "To or CC" textbox, list of names should appear automatically.

Please let me know how to do this.

I want to avoid Javascript code for this functionality. Just in case if there is no solution way except using Javascript then only I can use it.

Please reply how to achieve this task.

I am using ASP.NET Textbox control for "To and CC"