Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "ComboboxDemo" and then click OK
Step 2: Design your form as below

Step 3: Create a State class to map data
public class States
{
public string ID { get; set; }
public string Name { get; set; }
}
Step 4: Add code to handle your form as below
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ComboboxDemo
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void cboState_SelectedIndexChanged(object sender, EventArgs e)
{
lblValue.Text = cboState.Text;
}
private void Form1_Load(object sender, EventArgs e)
{
//Add item to combobox
cboState.Items.Add("Arizona");
cboState.Items.Add("Ohio");
cboState.SelectedIndex = 1;
//Clear all item cboState2
cboState2.Items.Clear();
//Init data
List<States> list = new List<States>();
list.Add(new States() { ID = "01", Name = "Texas" });
list.Add(new States() { ID = "02", Name = "Ohio" });
list.Add(new States() { ID = "02", Name = "Utah" });
list.Add(new States() { ID = "04", Name = "Vermont" });
//Set display member and value member for combobox
cboState2.DataSource = list;
cboState2.ValueMember = "ID";
cboState2.DisplayMember = "Name";
}
private void cboState2_SelectionChangeCommitted(object sender, EventArgs e)
{
//Cast item to State object
States obj = cboState2.SelectedItem as States;
if (obj != null)
lblValue.Text = obj.Name;
}
}
}
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