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MessageBox.Show Method (String, String, MessageBoxButtons, MessageBoxIcon)

Displays a message box with specified text, caption, buttons, and icon.

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

public static DialogResult Show(
	string text,
	string caption,
	MessageBoxButtons buttons,
	MessageBoxIcon icon
)

Parameters

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.

Return Value

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

ExceptionCondition
InvalidEnumArgumentException

The buttons parameter specified is not a member of MessageBoxButtons.

-or-

The icon parameter specified is not a member of MessageBoxIcon.

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.

You can have a maximum of three buttons on the message box.

The following code example demonstrates one of the Show methods when handling the ComboBox.DropDown event. To run the example, paste the following code in a form and call the InitializeComboBox method from the form's constructor or Load method.



	// Declare ComboBox1.
	internal System.Windows.Forms.ComboBox ComboBox1;

	// Initialize ComboBox1.
	private void InitializeComboBox()
	{
		this.ComboBox1 = new ComboBox();
		this.ComboBox1.Location = new System.Drawing.Point(128, 48);
		this.ComboBox1.Name = "ComboBox1";
		this.ComboBox1.Size = new System.Drawing.Size(100, 21);
		this.ComboBox1.TabIndex = 0;
		this.ComboBox1.Text	= "Typical";
		string[] installs = new string[]{"Typical", "Compact", "Custom"};
		ComboBox1.Items.AddRange(installs);
		this.Controls.Add(this.ComboBox1);
		
		// Hook up the event handler.
		this.ComboBox1.DropDown +=  
			new System.EventHandler(ComboBox1_DropDown);
	}

	// Handles the ComboBox1 DropDown event. If the user expands the  
	// drop-down box, a message box will appear, recommending the
	// typical installation.
	private void ComboBox1_DropDown(object sender, System.EventArgs e)
	{
		MessageBox.Show("Typical installation is strongly recommended.", 
		"Install information", MessageBoxButtons.OK, 
			MessageBoxIcon.Information);
	}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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