How to show Error & Warning Message Box in .NET | C# MessageBox.Show Examples

A MessageBox is a predefined dialog box that displays application-related information to the user. Message boxes are also used to request information from the user.

In this article i will show you how you can display the error message and warning message in windows application using C#.net and VB.Net.

Some of my previous articles are as follows: Connect Multiple Events to a Single Event Handler in Windows Forms Using C#.Net and VB.Net , Remove Selected Item From Listbox C#.Net and VB.net , How to add/move multiselected items from one listbox to another listbox in C#.Net and VB.Net | C# multiple selection listbox move Using C#.Net , Transfer Listbox Items to Another Listbox Using C#.Net and VB.Net | How to Move List Box Items to another List Box in C# , Event Handling in windows programming using C# | How To Add Events at run time in windows application controls using C#.Net and VB.Net .

So for this article first create a new windowsapplication.  Now add the two button one for displaying the error message and other for displaying the warning message.

C#.Net

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Collections; namespace ProjectDemo_Windows {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();                   }         private void button1_Click_1(object sender, EventArgs e)         {             MessageBox.Show("This is an error message.", "Error..", MessageBoxButtons.OK, MessageBoxIcon.Error);         }         private void button2_Click(object sender, EventArgs e)         {             MessageBox.Show("This is a warning message.", "Warning..", MessageBoxButtons.OK, MessageBoxIcon.Warning);         }     } }

VB.Net

Imports System Imports System.Collections.Generic Imports System.ComponentModel Imports System.Data Imports System.Drawing Imports System.Linq Imports System.Text Imports System.Windows.Forms Imports System.Collections Namespace ProjectDemo_Windows     Partial Public Class Form1         Inherits Form         Public Sub New()             InitializeComponent()         End Sub         Private Sub button1_Click_1(ByVal sender As Object, ByVal e As EventArgs)             MessageBox.Show("This is an error message.", "Error..", MessageBoxButtons.OK, MessageBoxIcon.[Error])         End Sub         Private Sub button2_Click(ByVal sender As Object, ByVal e As EventArgs)             MessageBox.Show("This is a warning message.", "Warning..", MessageBoxButtons.OK, MessageBoxIcon.Warning)         End Sub     End Class End Namespace

Now run the application

Error message

Warning Message

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