C# Windows Forms MessageBox Examples

Let us look at a simple C# Windows Forms MessageBox example.

Example 1: HelloWorldMessageBox

This example will comprise the following files:

• HelloWorldMessageBox.cs

Step 1: Create Project

1. The first step is to create a C# Project.
2. Go to FILE-->New-->Project to create a new project.

Step 2: Write Code

Write Code as follows:

*(a). HelloWorldMessageBox.cs

Create a file named HelloWorldMessageBox.cs

Here is the full code

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

namespace Examples {
  class MainClass {
    public static void Main() {
      Application.EnableVisualStyles();

      Button button = new Button();
      button.Text = "Click me";
      button.Location = new Point(10, 10);
      button.Width = 90;
      button.Click += delegate(object sender, EventArgs e) {
        MessageBox.Show("Hello, World!");
      };

      Form form = new Form();
      form.Text = "Hello World Form";
      form.Controls.Add(button);

      Application.Run(form);
    }
  }
}

Run

Simply copy the source code into your C# Project,Build and Run. Alternatively download the code using the links provided below, then open the .csproj project, build and run.

Reference

Download the code using the below links:

Number	Link
1.	Download Example
2.	Follow code author

Example 2: MessageBox

This example will comprise the following files:

• MessageBox.cs

Step 1: Create Project

1. The first step is to create a C# Project.
2. Go to FILE-->New-->Project to create a new project.

Step 2: Write Code

Write Code as follows:

*(a). MessageBox.cs

Create a file named MessageBox.cs

Here is the full code

using System;
using System.Windows.Forms;

namespace Examples {
  class Form1 : Form {
    // The main entry point for the application.
    public static void Main() {
      Application.EnableVisualStyles();
      Application.Run(new Form1());
    }

    public Form1() {
      buttonShowMessage.Location = new System.Drawing.Point(10, 10);
      buttonShowMessage.Width = 100;
      buttonShowMessage.Text = "MessageBox";
      buttonShowMessage.Click += delegate(object sender, EventArgs e) {
        DialogResult result = MessageBox.Show("Hello, World!", "Message", MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk);
        labelDialogResult.Text = string.Format("DialogResult = {0}", result);
      };

      labelDialogResult.Location = new System.Drawing.Point(10, 45);
      labelDialogResult.Width = 200;

      StartPosition = FormStartPosition.Manual;
      Location = new System.Drawing.Point(400, 200);
      Text = "MessageBox example";
      Controls.AddRange(new Control[] { buttonShowMessage, labelDialogResult});
    }

    private Button buttonShowMessage = new Button();
    private Label labelDialogResult = new Label();
  }
}

Run

Simply copy the source code into your C# Project,Build and Run. Alternatively download the code using the links provided below, then open the .csproj project, build and run.

Reference

Download the code using the below links:

Number	Link
1.	Download Example
2.	Follow code author