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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
)
public static DialogResult Show (
	String text, 
	String caption, 
	MessageBoxButtons buttons, 
	MessageBoxIcon icon
)
public static function Show (
	text : String, 
	caption : String, 
	buttons : MessageBoxButtons, 
	icon : MessageBoxIcon
) : DialogResult
Not applicable.

Parameters

text

The text to display in the message box.

caption

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

buttons

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

icon

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

Return Value

One of the DialogResult values.

Exception typeCondition

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);
}

// Declare comboBox1.
System.Windows.Forms.ComboBox comboBox1;

// Initialize comboBox1.
private void InitializeComboBox()
{
    this.comboBox1 = new ComboBox();
    this.comboBox1.set_Location(new System.Drawing.Point(128, 48));
    this.comboBox1.set_Name("comboBox1");
    this.comboBox1.set_Size(new System.Drawing.Size(100, 21));
    this.comboBox1.set_TabIndex(0);
    this.comboBox1.set_Text("Typical");
    String installs[] = new String[] { "Typical", "Compact", "Custom" };
    comboBox1.get_Items().AddRange(installs);
    this.get_Controls().Add(this.comboBox1);
    // Hook up the event handler.
    this.comboBox1.add_DropDown(new System.EventHandler(
        comboBox1_DropDown));
} //InitializeComboBox

// 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);
} //comboBox1_DropDown

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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