Question

I’m working on building a List using Combobox that when a Client is selected from the combo list, it loads a specific URL. Problem is the List is blank.
Below is the code, but I don’t see what I’m missing but it could be simple oversight since this is the first time I’m building a Combobox like this.

public partial class Form1 : Form
{
    List<MyClient> clients;
    public Form1()
    {
        InitializeComponent();
        clients = new List<MyClient>();
        clients.Add(new MyClient { ClientName = "Client 1", UrlAddress = @"http://www.google.com" });
        BindBigClientsList();
    }

    private void BindBigClientsList()
    {
        BigClientsList.DataSource = clients;
        BigClientsList.DisplayMember = "ClientName";
        BigClientsList.ValueMember = "UrlAddress";
    }

    private void BigClientsList_SelectedIndexChanged(object sender, EventArgs e)
    {
        MyClient c = BigClientsList.SelectedItem as MyClient;
        if (c != null)
        {
            string url = c.ClientName;
            Process.Start(url);
        }
    }
}
class MyClient
{
    public string ClientName { get; set; }
    public string UrlAddress { get; set; }
}

Answer 1

Your constructor should look like this

public Form1() 
    { 
        InitializeComponent(); 
        List<MyClient> clients = new List<MyClient>(); 
        clients.Add(new MyClient { ClientName = "Client 1", UrlAddress = @"http://www.google.com" });
        foreach(MyClient client in clients)
        {
            BigClients.Items.Add(client);
        } 
    }

This adds two things:

• Add the object to the ComboBox. Without that, how is the item supposed to appear in the ComboBox?
• Put the code after the InitializeComponent() statement. Otherwise, when you try to add the MyClient object to the ComboBox, it will throw a NullReferenceException.