Button Property
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MouseEventArgs.Button Property

Gets which mouse button was pressed.

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

public MouseButtons Button { get; }

Property Value

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

The following code examples handles the MouseDown event on a TextBox control so that clicking the right mouse button selects all of the text in the control. This example requires that you have a form with a TextBox control named textBox1.

private void Form1_Load(object sender, EventArgs e)
    // This line suppresses the default context menu for the TextBox control. 
    textBox1.ContextMenu = new ContextMenu();
    textBox1.MouseDown += new MouseEventHandler(textBox1_MouseDown);

void textBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
    if (e.Button == MouseButtons.Right)
        textBox1.Select(0, textBox1.Text.Length);

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Pocket PC

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

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