Listbox in C#

Creating a Listbox in C# at design time

1. Create a new project in Visual Studio Code.
   
2. Select WindowsFormApp and Create new.
   
3. New Form will appear on the screen like this.
   
4. Select the list box control from the toolbox.
   
5. Drag and Drop the list box into the form.
   
6. After Drag and Drop, go to properties and modify based on your use.
   
7. Add items like string.

Creating a Listbox in C# at run time

Creating a Listbox at run time is a little more complicated process than what we saw above. Here the steps are defined using the Listbox class, and each item is added using the Add() method. We also need to set up the properties defined in the list box class.

Code:

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 WindowsFormsApp25 {
  
public partial class Form1: Form {
  
    public Form1()
    {
        InitializeComponent();
    }
  
    private void Form1_Load(object sender, EventArgs e)
    {
  
        // Create ListBox from class ListBox
        ListBox  list = new ListBox();

        // Set the properties of list
        list.Location = new Point(297, 119);
        list.Size = new Size(150, 115);
        list.ForeColor = Color.Black;

        // After Creating a list class add list items 
        list.Items.Add(“Item 1”);
        list.Items.Add(“Item 2”);
        list.Items.Add(“Item 3”);
        list.Items.Add(“Item 4”);
        list.Items.Add(“Item 5”);
  
        // Adding ListBox control to the form
        this.Controls.Add(list);
    }
  }
}

Output:-

Constructors of ListBox in C#

Properties of ListBox in C#

FAQs

1. How to create a new ListBox in C#?
   We could develop Listbox in C# during run time and design time. Creating a ListBox in design time is much simpler compared to run-time. In run time, we use the Listbox class to create an instance of Listbox, and during the design phase, we drag and drop the  Listbox in the toolbar and add items.
    
2. What are the uses of Listbox in C#?
   ListBox helps us by providing a user interface to display the list of items. These items could be selected single or multiple times. List Box in C# could have multiple columns, and these columns can contain controls and images.
    
3. How to get the index of selected items in Listbox in C#?
   SelectedIndex property helps us to get the index of the currently selected item in a ListBox

Key Takeaways

In this article, we have discussed Listbox in C#. We have briefly explained how to create a Listbox control in C#. We have also briefly explained the properties and constructors in Listbox.

I hope this article must have helped you improve your learning in C#. To discover more about such content and practice some quality questions, please visit our Guided Path in  Coding Ninjas Studio.To become more confident in data structures and algorithms, try out DS and Algo courses. Till then, all the best for your future adventure and Happy Coding.