Passing a toolbox control to a method as parameter in c#

Question

I try to develop a dynamically created toolbox control in my website and I need to make that as efficient as possible. I have two conditions like the following:

private void produceControls()
{
    if (General.survey_answer_type_id == 3)
        {
            rbtnList = new RadioButtonList();
            rbtnList.ID = "ControlID_3";
            SqlDataReader dr_answer = cmd.ExecuteReader();
            while (dr_answer.Read())
            {
                rbtnList.Items.Add(dr_answer["answer"].ToString());
            }

            PlaceHolder1.Controls.Add(rbtnList);
        }
    else if (General.survey_answer_type_id == 4)
        {
            chkBoxList = new CheckBoxList();
            chkBoxList.ID = "ControlID_4";
            SqlDataReader dr_answer = cmd.ExecuteReader();
            while (dr_answer.Read())
            {
                chkBoxList.Items.Add(dr_answer["answer"].ToString());
            }
            PlaceHolder1.Controls.Add(chkBoxList); 
        }
}

These conditions are the same except for the toolbox control name itself. I need to have a method to use in suitable conditions declared as (this is just an abstract):

public void foo(var toolbox_name)
{
        toolbox_name = new RadioButtonList();
        toolbox_name.ID = "ControlID_3";
        SqlDataReader dr_answer = cmd.ExecuteReader();
        while (dr_answer.Read())
        {
            toolbox_name.Items.Add(dr_answer["answer"].ToString());
        }
}

And then I want to use it like:

private void produceControls()
    {
        if (General.survey_answer_type_id == 3)
            {
                foo(rbtnList);
            }
        else if (General.survey_answer_type_id == 4)
            {
                foo(chkBoxList);
            }
    }

How could I achieve this? Thank you.

Answer 1

I just needed to know what the parent class of CheckBoxlist and RadioButtonList is. It is just ListControl.

For example:

public void showListControl(ListControl lstcontrol)
{
        lstcontrol.ID = "ControlID_3";
        SqlDataReader dr_answer = cmd.ExecuteReader();
        while (dr_answer.Read())
        {
            lstcontrol.Items.Add(dr_answer["answer"].ToString());
        }
}

And then use it like:

RadioButtonList rbtnList = new RadioButtonList();
showListControl(rbtnList);