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MessageBoxIcon Enumeration

Specifies constants defining which information to display.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public enum MessageBoxIcon

Member nameDescription
AsteriskThe message box contains a symbol consisting of a lowercase letter i in a circle.
ErrorThe message box contains a symbol consisting of white X in a circle with a red background.
ExclamationThe message box contains a symbol consisting of an exclamation point in a triangle with a yellow background.
HandThe message box contains a symbol consisting of a white X in a circle with a red background.
InformationThe message box contains a symbol consisting of a lowercase letter i in a circle.
NoneThe message box contain no symbols.
QuestionThe message box contains a symbol consisting of a question mark in a circle. The question-mark message icon is no longer recommended because it does not clearly represent a specific type of message and because the phrasing of a message as a question could apply to any message type. In addition, users can confuse the message symbol question mark with Help information. Therefore, do not use this question mark message symbol in your message boxes. The system continues to support its inclusion only for backward compatibility.
StopThe message box contains a symbol consisting of white X in a circle with a red background.
WarningThe message box contains a symbol consisting of an exclamation point in a triangle with a yellow background.

This enumeration is used by the MessageBox class. The description of each member of this enumeration contains a typical representation of the symbol. The actual graphic displayed is a function of the operating system constants. In current implementations there are four unique symbols with multiple values assigned to them.

The following code example shows how to use a MessageBox to inform the user of a missing entry in a TextBox. This example requires that the method is called from an existing form with a Button and a TextBox on it.

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    const string message =
        "Are you sure that you would like to close the form?";
    const string caption = "Form Closing";
    var result = MessageBox.Show(message, caption,
                                 MessageBoxButtons.YesNo,
                                 MessageBoxIcon.Question);

    // If the no button was pressed ... 
    if (result == DialogResult.No)
    {
        // cancel the closure of the form.
        e.Cancel = true;
    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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