Shinu's approach, which is an example for the add() method in Murali's help article
, works without errors on my side. You may give it a try and reply, if you have further questions.
constructor that you used was most probably needed, because you were using a RadDropDownList control, instead of RadComboBox. By implementing a RadComboBoxItem() constructor for RadDropDownList, you ran into an error when following the RadComboBox help article.
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