Your Question is not very clear. What I understood is - You have created dynamic DropDownList and RadioButton and now you want to assign some Event to it.
Try as below code to assign an Event to your dynamically created DropDownList.
myDropdownList.SelectedIndexChanged += new EventHandler(myDropdownList_SelectedIndexChanged);
myDropdownList.AutoPostBack = true;
private void myDropdownList_SelectedIndexChanged(object sender, EventArgs e)
{
}
And try as below code to assign an Event to your dynamically created RadioButton.
myRadioButton.CheckedChanged += new EventHandler(this.myRadioButton_CheckedChanged);
myDropdownList.AutoPostBack = true;
private void myRadioButton_CheckedChanged(object sender, System.EventArgs e)
{
}
Hope this helps.