MessageBox.Show Method in C# - C# Desktop application tutorial

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MessageBox.Show():

MessageBox is a class in C# and Show is a method that displays a message in a small window in the center of the Form.

MessageBox is used to provide confirmations of a task being done or to provide warnings before a task is done.

Create a Windows Forms app in Visual Studio and add a button on it. Something like this below.

Example
Let's say, you want to show a message on a button click event handler. Here is the code for that.

OUTPUT

Note: By default the OK Button will be shown.

DialogResult

DialogResult is an enumeration of the possible return values of a dialog box including a MessageBox. The Show method returns a DialogResult that tells us what button a user has clicked on the message box.

public static System.Windows.Forms.DialogResult Show (string text);

Here are the values of DialogResult:

Abort - The dialog box return value is Abort (usually sent from a button labeled Abort).
Cancel - The dialog box return value is Cancel (usually sent from a button labeled Cancel).
Ignore - The dialog box return value is Ignore (usually sent from a button labeled Ignore).
No - The dialog box return value is No (usually sent from a button labeled No).
None - Nothing is returned from the dialog box. This means that the modal dialog continues running.
OK - The dialog box return value is OK (usually sent from a button labeled OK).
Retry - The dialog box return value is Retry (usually sent from a button labeled Retry).
Yes - The dialog box return value is Yes (usually sent from a button labeled Yes).

For example, if you want to ask a user to close a form on a Yes button click of a message box, you can do something like this:

Form1.cs code:

private void button1_Click(object sender, EventArgs e)
{
DialogResult d;
d=MessageBox.Show("Welcome to C# Corner","Learn C#", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if(d==DialogResult.Yes)
{
Close();
}
}


source
https://www.c-sharpcorner.com/UploadFile/736bf5/messagebox-show