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C# - NumericUpDown Class - GeeksforGeeks

Last Updated : 20 May, 2025

In Windows Forms, the NumericUpDown control is used to provide a Windows spin box or an up-down control that displays the numeric values. The NumericUpDown control provides an interface that moves using an up and down arrow and holds a pre-defined numeric value. The NumericUpDown class in C# is used to represent the Windows numeric up-down box and also provides different types of properties, methods, and events. It is defined under System.Windows.Forms namespace.

NumericUpDown is commonly used in many apps in things like:

• Picking time periods or limits for settings.
• Changing options in desktop programs where numbers need to be entered within a set range.
• Choosing age, amount, or percentage in forms.

There are mainly two ways to create a NumericUpDown in Windows Forms, which are mentioned below.

• Drag and drop (Design-Time)
• Custom NumericUpDown (Run-Time)

This is the easiest way to create a NumericUpDown in Windows Forms using Visual Studio. We just have to open the toolbox and drag and drop the NumericUpDown control on the form in the designer, and further, we can change the appearance of the NumericUpDown using the properties. Follow these steps to create a NumericUpDown.

Step 1: Now, locate the project with the name. Here, we are using the default name, which is Form1, and it will open a form in the editor that we can further modify.

In the image, we have two files that are open one Design and there is Form1.cs these two play a major role. We use the Form 1.cs file for the custom logic.

Step 2: Now open a Toolbox go to the view > Toolbox or ctrl + alt + x.

Step 3. Now open the common controls and drag and drop the NumericUpDown on the form where we want to it be placed.

Step 4. Now open the properties of the NumericUpDown contro press right-click on the NumericUpDown and it will open the properties solution explorer now we can change the appearance and the behaviour of the NumericUpDown.

Now we can make different kinds of changes using properties and change the appearance.

Output:

In this method, we are going to modify the Form1.cs file and add custom code modification in C# with the help of the GroupBox class. The following steps show how to create a GroupBox dynamically:

Step 1: Create a NumericUpDown control using the NumericUpDown() constructor is provided by the NumericUpDown class.

// Creating a NumericUpDown control

NumericUpDown nbox = new NumericUpDown();

Step 2: After creating a NumericUpDown control, set the property of the NumericUpDown control provided by the NumericUpDown class.

// Setting the properties of NumericUpDown control

nbox.Location = new Point(386, 130);

nbox.Size = new Size(126, 26);

nbox.Font = new Font("Bodoni MT", 12);

nbox.Value = 18;

nbox.Minimum = 18;

nbox.Maximum = 30;

nbox.BackColor = Color.LightGreen;

nbox.ForeColor = Color.DarkGreen;

nbox.Increment = 1;

nbox.Name = "MySpinBox";

Step 3: Now add the NumericUpDown control to the form using the following statement:

// Adding this control

// to the form

this.Controls.Add(nbox);

Step 4: Now double-click on the form in Design and it will open the Form1.cs file where code is written in C#. Here, the program file is Form 1.cs. Now write this code in Form1.cs file.

Form1.cs file:

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Load += Form1_Load; // Subscribe to form load event
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Create and configure a label to describe the form
            Label formLabel = new Label();
            formLabel.Location = new Point(348, 61);
            formLabel.Size = new Size(215, 20);
            formLabel.Text = "Form";
            formLabel.Font = new Font("Bodoni MT", 12);
            this.Controls.Add(formLabel);

            // Create and configure a label for the NumericUpDown
            Label ageLabel = new Label();
            ageLabel.Location = new Point(242, 136);
            ageLabel.Size = new Size(103, 20);
            ageLabel.Text = "Enter Age";
            ageLabel.Font = new Font("Bodoni MT", 12);
            this.Controls.Add(ageLabel);

            // Create the NumericUpDown control
            NumericUpDown numericUpDown = new NumericUpDown();

            // Set location and size on the form
            numericUpDown.Location = new Point(386, 130);
            numericUpDown.Size = new Size(126, 26);

            // Set font style for better readability
            numericUpDown.Font = new Font("Bodoni MT", 12);

            // Set initial value, minimum and maximum limits
            numericUpDown.Value = 18;
            numericUpDown.Minimum = 18;
            numericUpDown.Maximum = 30;

            // Customize colors for better UI experience
            numericUpDown.BackColor = Color.LightGreen;
            numericUpDown.ForeColor = Color.DarkGreen;

            // Set increment for each click on up/down buttons
            numericUpDown.Increment = 1;

            // Assign a meaningful name for reference
            numericUpDown.Name = "MySpinBox";

            // Add the NumericUpDown control to the form
            this.Controls.Add(numericUpDown);
        }
    }
}

Output:

This class consists one constructor, with the help of which we can create objects of this class. The constructor available in this class is listed below:

NumericUpDown(): This constructor is used to initialize a new instance of the NumericUpDown class.

Syntax:

NumericUpDown()

The properties of this class is listed below:

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