How to Set values for Combo box,Date time controls,Number Controls.

How to Set values for Combo box,Date time controls,Number Controls.

Scenario is:
                 Assume in my web page there are combo boxes,date/time pickers,number controls.Here,I have to set the values into combo boxes,date/time pickers,number controls. I am using Test Studio Project and hope to implement code in the ''New Coded Step'' area. Please guide through code, how to SET values to following fields. I do not need a Enumeration examples.
               I have done for Text-boxes,check-boxes like :

               //Set text from the excel to text box.
              HtmlInputText firstname= Manager.ActiveBrowser.Find.ById<HtmlInputText>("txtfirstname");
              firstname.Text = "telerik";

Here,I want to do like this for combo box,date/time pickers,number control. ,So,Please,Help me out :

With this,I have attached a snapshot of combo  box , date/time pickers,number control.I hope,i will get a positive reply soon from you guys.