How to set the Height of the Elements present in 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 can set the height of the elements present in the ListBox using the ItemHeight Property of the ListBox. The maximum height of the ListBox item is 255 pixels. You can set this property in two different ways:

1. Design-Time: It is the easiest way to set the height of the elements present in 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 height of the elements present in the ListBox.

    Output:

2. Run-Time: It is a little bit trickier than the above method. In this method, you can set the height of the elements present in the ListBox control programmatically with the help of given syntax:

public virtual int ItemHeight { get; set; }

Here, the value of this property is of System.Int32 type. The height of the element is always considered in pixels. It will throw an ArgumentOutOfRangeException if the value of this property was set to less than 0 or more than 255 pixels. The following steps show how to set the height of the elements present in 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 lstbox = new ListBox();
    
  • Step 2: After creating ListBox, set the ItemHeight Property of the ListBox provided by the ListBox class.
    // Setting the height of the items
    lstbox.ItemHeight = 13;
  • Step 3: And last add this ListBox control to the form using Add() method.
    // Add this ListBox to the form
    this.Controls.Add(lstbox);
    

    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 WindowsFormsApp28 {
      
    public partial class Form1 : Form {
      
        public Form1()
        {
            InitializeComponent();
        }
      
        private void Form1_Load(object sender, EventArgs e)
        {
            // Creating and setting the
            // properties of the label
            Label lb = new Label();
            lb.Location = new Point(243, 80);
            lb.Text = "Select post";
      
            // Adding label control to the form
            this.Controls.Add(lb);
      
            // Creating and setting the
            // properties of ListBox
            ListBox lstbox = new ListBox();
            lstbox.Location = new Point(246, 104);
            lstbox.ItemHeight = 13;
            lstbox.Items.Add("Intern");
            lstbox.Items.Add("Software Engineer");
            lstbox.Items.Add("Project Manager");
            lstbox.Items.Add("HR");
      
            // Adding listbox control to the form
            this.Controls.Add(lstbox);
        }
    }
    }

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    Output:



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