display selecteditem.value from dropdownlist and checkboxlist in a textbox

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C#

When selecting "MS SQL Server" in the dropdownlist and also choose "Beginner" in the CheckboxList i want it to be displayed in the Textbox afther clicking the button "Add" So the result should be in the textbox MS SQL Server - Beginner In my case the code looks like this and it only displays "Beginner" in the textbox and not also the value i select in the dropdownlist.

protected void ButtonAddDataBase_Click(object sender, EventArgs e)
    {


            switch (DropDownListDataBase.SelectedItem.Value)
            {
                case "MS SQL Server":
                    TextBoxResultDataBaseSkills.Text = DropDownListDataBase.SelectedItem.Value;

                    break;

            }
            switch (CheckBoxListDataBase.SelectedItem.Value)
            {
                case "Beginner":
                    TextBoxResultDataBaseSkills.Text = CheckBoxListDataBase.SelectedItem.Value;
                    break;
            }





    }

Here is a link with a image also
http://sharepoint.stackexchange.com/questions/61602/display-selecteditem-value-from-dropdownlist-and-checkboxlist-in-a-textbox[^]

[Edit]Made able to click on the link[/Edit]