29 Nov 2011
03 Feb 2012
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I'm not sure about all of what you are saying, but I will try to help.
First, what do you mean by "show it on page instead of form"? Really, all of your server side controls should be inside of a form.
Second, if you are working with a custom control, (I assume you are) and using a standard drop down list, (not a RadComboBox, which works slightly differently) you need to override the OnPreRender event of your custom control, and set your drop down's datasource, then call databind as you usually would.
If what I've said above isn't quite enough, I would suggest you research .net databinding in general before trying to move ahead.