Home » .Net » C#.Net » C#.Net Windows Development

Design a Windows Application to demonstrate the use of ListBox in C#

Here, we are implementing a windows application that will demonstrate example of ListBox in C# with some of the basic operations like Add, Remove, Clear, Get Selected Items etc.
Submitted by IncludeHelp, on September 18, 2018

Following operations are performing on the ListBox:

1. Add
2. Remove
3. Clear
4. Get selected items
5. etc...

Follow controls are using in the application:

• txtInput (TextBox) : To take user input.
• lblCount (Label) : To show count of list-box items.
• lstItem (ListBox) : List-box to contain list of items.
• btnAdd (Button) : To add entered item into list.
• btnRemove (Button) : To remove selected item from list.
• btnShow (Button) : To show selected item in message-box.
• btnClear (Button) : To clear complete list.

Example (form design):

C# Source 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 MyWinApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            lstItem.Items.Add(txtInput.Text);
            txtInput.Text = "";
            lblCount.Text = "Count: " + lstItem.Items.Count;
        }

        private void btnRmv_Click(object sender, EventArgs e)
        {
            lstItem.Items.RemoveAt(lstItem.SelectedIndex);
            lblCount.Text = "Count: " + lstItem.Items.Count;
        }

        private void btnShow_Click(object sender, EventArgs e)
        {
            MessageBox.Show(lstItem.SelectedItem.ToString());
        }

        private void btnClr_Click(object sender, EventArgs e)
        {
            lstItem.Items.Clear();
            lblCount.Text = "Count: " + lstItem.Items.Count;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            lblCount.Text = "Count: " + lstItem.Items.Count;
        }
    }
}

In the above code, we used button click events for performing tasks. We used following methods:

1. Listbox.Itmes.Add(text)
2. Listbox.Itmes.RemoveAt(index)
3. Listbox.Itmes.Clear()

We used some properties like:

1. lstItem.Items.Count
2. lstItem.SelectedIndex
3. lstItem.SelectedItem