Create customizing dropdownlist in asp.net / c #

Question

I am beginner in asp.net and c # and I came across a request for creation of a component shown in the link. Really do not know how to do this, nor where to start. There is a component of this type existing in the standard suite of asp.net like a tip and help to make est component. He is like a dropdownlist, spo that instead of items are checkboxes that can choose, in the end there is a label to confirm the choice and can deal with it programmatically selected values.

I thank you.

Answer 1

Read some basic information on how to create your own controls. For example this and this.