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How to add Selected Item from ComboBox to ListBox in Windows form

Introduction

In my previous post we have been bind DropdownList using Complex datatype . Today we will learn how to add Selected Item from ComboBox to ListBox on button click event. follow some steps for add items to ListBox.

Step-1: Take a class file with some fields in the application.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CoffieShop
{
  
    class CoffieShop
    {
        public string Product_Name { get; set; }
        public decimal price { get; set; }

    }
}

Step-2: Drop a ComboBox control to the design window.
Step-3: Create a instance of the List class also bind list with the class.

namespace CoffieShop
{
    public partial class Form1 : Form
    {
        List<CoffieShop> item = new List<CoffieShop>();

}
}

Step-4:  Initiate class fields with some value and add to the List in Form_Load Event

 public Form1()
       {
           item.Add(new CoffieShop() { Product_Name = "pizza", price = 12.12M });
           item.Add(new CoffieShop() { Product_Name = "burger", price = 15.12M });
      
            InitializeComponent();
        } 
Step-5: Drop One Button Control to the Design window
Step-6: Add selected item from ComboBox to ListBox control on Button_Click Event
  private void button3_Click(object sender, EventArgs e)
        {
           var pro = comboBox1.SelectedItem as CoffieShop;
           listBox1.Items.Add(pro);
           listBox1.DisplayMember = "Product_Name";


            
            
        }
Complete code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;


namespace CoffieShop
{
    public partial class Form1 : Form
    {
        List<CoffieShop> item = new List<CoffieShop>();
   
        public Form1()
       {
           item.Add(new CoffieShop() { Product_Name = "pizza", price = 12.12M });
           item.Add(new CoffieShop() { Product_Name = "burger", price = 15.12M });
   

         
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            comboBox1.DataSource = item;
            comboBox1.DisplayMember = "Product_Name";
        }

        private void button3_Click(object sender, EventArgs e)
        {
           var pro = comboBox1.SelectedItem as CoffieShop;
           listBox1.Items.Add(pro);
           listBox1.DisplayMember = "Product_Name";


         
         
        }
     
 
    }
}

Output
How to add Selected Item from ComboBox to ListBox in Windows form

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