Dynamic Combo Box problem

Bangs head on wall. Yup that worked. I am getting something else that is causing the program to crash but it is working now. Thanks for the help

John, I am not sure I am clear on your real intent, but...

The event I used is the comboBox SelectedValueChanged.  I took the code you had in your previous post and used this event to call the GetFirstBox function and make the second comboBox visible.  In this way, when the otpButtonOne is checked, comboBoxOne is set up with a list of colors.  comboTwo and Three are not visible.  When the user selects a color, the cmbComboOne_SelectedValueChanged event is called, gets the selection text and calls GetFirstBox that sets up comboBoxTwo and makes it visible.  At this point I am not sure how you want things to work, but hopefully this helps.  Here's the code.

public Form1()
{
InitializeComponent();
}
private string m_selection;
private void optButtonOne_CheckedChanged(object sender, EventArgs e)
{
this.cmbComboOne.Items.Clear();
this.cmbComboTwo.Visible = false;
this.cmbComboThree.Visible = false;
this.cmbComboOne.Text = "Select a Color";
this.cmbComboOne.Items.AddRange(new object[] { "blue", "green", "purple" });
//m_selection = this.cmbComboOne.SelectedItem.ToString();
//GetFirstBox(m_selection);
}
private void optButtonTwo_CheckedChanged(object sender, EventArgs e)
{
 
if (optButtonTwo.Checked == true)
{
this.cmbComboOne.Items.Clear();
this.cmbComboOne.Text = "Select a Item";
this.cmbComboTwo.Visible = false;
this.cmbComboThree.Visible = false;
this.cmbComboOne.Items.AddRange(new object[] { "cars", "boats", "trains" });
}
}
public void GetFirstBox(string selection)
{
this.cmbComboTwo.Visible = true;
this.cmbComboTwo.Items.Clear();
this.cmbComboTwo.Text = "Select a Second Item";
this.cmbComboTwo.Items.AddRange(new object[] { "yellow", "red", "orange" });
 
}
private void cmbComboOne_SelectedValueChanged(object sender, EventArgs e)
{
m_selection = this.cmbComboOne.SelectedItem.ToString();
GetFirstBox(m_selection);
}
 
}

Hi Micheal, what event handler did you use to get your second combobox to become visible.  created a generic Form with just combo boxes to test this but I cannot get my second combobox to become visible.

Here is my generic form.

namespace Combo_Test
{
    public partial class Form1 : Form
    {
        private string m_selection;

        public Form1()
        {
            InitializeComponent();
        }

        private void optButtonOne_CheckedChanged(object sender, EventArgs e)
        {
            this.cmbComboOne.Items.Clear();
            this.cmbComboTwo.Visible = false;
            this.cmbComboThree.Visible = false;
            this.cmbComboOne.Text = "Select a Color";
            this.cmbComboOne.Items.AddRange(new object[] { "blue" , "green", "purple" });
            m_selection = this.cmbComboOne.SelectedItem.ToString();
            GetFirstBox(m_selection);
        }

        private void optButtonTwo_CheckedChanged(object sender, EventArgs e)
        {
           

            if (optButtonTwo.Checked == true)
            {
                this.cmbComboOne.Items.Clear();
                this.cmbComboOne.Text = "Select a Item";
                this.cmbComboTwo.Visible = false;
                this.cmbComboThree.Visible = false;
                this.cmbComboOne.Items.AddRange(new object[] { "cars", "boats", "trains" });
            }
        }

        public void GetFirstBox(string selection)
        {
            this.cmbComboTwo.Visible = true;
            this.cmbComboTwo.Items.Clear();
            this.cmbComboTwo.Text = "Select a Second Item";
            this.cmbComboTwo.Items.AddRange(new object[] { "yellow", "red", "orange" });


        }
    }
}

I am really not sure why my code is not working. I am going to try and test it without the DB call and see if it works. It is odd how it only works when you switch to another radio button and then switch back.

What event handler would you use for the second question?

Sorry that did not work for you may be I do not understand the problem.

 I do not see it in some test code I tried.  I copied your code snipit into a form with three CBs only one visible.  I put some bogus data in that CB.  I then connected the visible CB to an event handler for event SelectedValueChanged.  In the event handler I called your GetProducColors().  The second CB became visible.  But of course I do not have the database connection etc.

An event handler could be used to do the something that you want from your second question.

That didn't work. But after doing some testign on a generic model the only way Iw as able to do this was to use a if statement based on the combobox data. But since the combobox data is not know before hand I cannot do this on this form. is there a way to do somethijng along these lines?

if anything is selected from the combobox do something?