How to set the Size of the ListBox in C#?

In Windows Forms, ListBox control is used to show multiple elements in a list, from which a user can select one or more elements and the elements are generally displayed in multiple columns. In ListBox, you are allowed to set the height and width of the ListBox in pixels using Size Property of the ListBox which makes your ListBox more attractive. You can set this property in two different ways:

1. Design-Time: It is the easiest way to set the size of the ListBox as shown in the following steps:

  • Step 1: Create a windows form as shown in the below image:
    Visual Studio -> File -> New -> Project -> WindowsFormApp
  • Step 2: Drag the ListBox control from the ToolBox and drop it on the windows form. You are allowed to place a ListBox control anywhere on the windows form according to your need.
  • Step 3: After drag and drop you will go to the properties of the ListBox control to set the size of the ListBox.



    Output:

2. RunTime: It is a little bit trickier than the above method. In this method, you can set the size of the ListBox control programmatically with the help of given syntax:

public System.Drawing.Size Size { get; set; }

Here, Size indicates the height and width of the ListBox in pixels. The following steps show how to set the size of the ListBox dynamically:

  • Step 1: Create a list box using the ListBox() constructor is provided by the ListBox class.
    // Creating ListBox using ListBox class constructor
    ListBox mylist = new ListBox();
    
  • Step 2: After creating ListBox, set the Size property of the ListBox provided by the ListBox class.
    // Setting the size of the ListBox
     mylist.Size = new Size(120, 95);
    
  • Step 3: And last add this ListBox control to the form using Add() method.
    // Add this ListBox to the form
    this.Controls.Add(mylist);
    

    Example:

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    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)
        {
      
            // Creating and setting 
            // the properties of ListBox
            ListBox mylist = new ListBox();
            mylist.Location = new Point(287, 109);
            mylist.Size = new Size(120, 95);
            mylist.ForeColor = Color.Purple;
            mylist.Items.Add(123);
            mylist.Items.Add(456);
            mylist.Items.Add(789);
      
            // Adding ListBox control to the form
            this.Controls.Add(mylist);
        }
    }
    }

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    Output:



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