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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 example handles the MouseDown event on a TextBox control so that clicking the right mouse button selects all the text in the control. This example requires that you have a form that contains 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);
    }
}

.NET Framework

Supported in: 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 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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