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MessageBox.Show Method (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String)

Displays a message box with the specified text, caption, buttons, icon, default button, options, and Help button, using the specified Help file.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
public static DialogResult Show(
	IWin32Window owner,
	string text,
	string caption,
	MessageBoxButtons buttons,
	MessageBoxIcon icon,
	MessageBoxDefaultButton defaultButton,
	MessageBoxOptions options,
	string helpFilePath
)

Parameters

owner
Type: System.Windows.Forms.IWin32Window

An implementation of IWin32Window that will own the modal dialog box.

text
Type: System.String

The text to display in the message box.

caption
Type: System.String

The text to display in the title bar of the message box.

buttons
Type: System.Windows.Forms.MessageBoxButtons

One of the MessageBoxButtons values that specifies which buttons to display in the message box.

icon
Type: System.Windows.Forms.MessageBoxIcon

One of the MessageBoxIcon values that specifies which icon to display in the message box.

defaultButton
Type: System.Windows.Forms.MessageBoxDefaultButton

One of the MessageBoxDefaultButton values that specifies the default button for the message box.

options
Type: System.Windows.Forms.MessageBoxOptions

One of the MessageBoxOptions values that specifies which display and association options will be used for the message box. You may pass in 0 if you wish to use the defaults.

helpFilePath
Type: System.String

The path and name of the Help file to display when the user clicks the Help button.

Return Value

Type: System.Windows.Forms.DialogResult
One of the DialogResult values.
ExceptionCondition
InvalidEnumArgumentException

buttons is not a member of MessageBoxButtons.

-or-

icon is not a member of MessageBoxIcon.

-or-

The defaultButton specified is not a member of MessageBoxDefaultButton.

InvalidOperationException

An attempt was made to display the MessageBox in a process that is not running in User Interactive mode. This is specified by the SystemInformation.UserInteractive property.

ArgumentException

options specified both DefaultDesktopOnly and ServiceNotification.

-or-

buttons specified an invalid combination of MessageBoxButtons.

A message box is a modal dialog box, which means no input (keyboard or mouse click) can occur except to objects on the modal form. The program must hide or close a modal form (typically in response to some user action) before input to another form can occur. You can use the owner parameter to specify a particular object, which implements the IWin32Window interface, that will serve as the dialog box's top-level window and owner.

When the user clicks the Help button, the Help file specified in the helpFilePath parameter is opened. The form that owns the message box (or the active form) also receives the HelpRequested event.

The helpFilePath parameter can be of the form C:\path\sample.chm or /folder/file.htm.

The following code example demonstrates how to show a message box that parented to the main form. The message box displays a Help button. When the user clicks the Help button, the Mspaint.chm Help file is opened. The example requires that the Mspaint.chm Help file is installed.

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


...


// Display a message box parented to the main form.  
// The Help button opens the Mspaint.chm Help file.
DialogResult r2 = MessageBox.Show (this, "Message with Help file.", 
                                   "Help Caption", MessageBoxButtons.OK, 
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 
                                   0, 
                                   "mspaint.chm");

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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