ToolStripDropDownItem.DropDownOpening Event

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Source:

ToolStripDropDownItem.cs

Occurs as the ToolStripDropDown is opening.

C#

public event EventHandler? DropDownOpening;

Event Type

EventHandler

Examples

The following code example demonstrates the use of this member. In the example, an event handler reports on the occurrence of the DropDownOpening event. This report helps you to learn when the event occurs and can assist you in debugging. To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.

To run the example code, paste it into a project that contains an instance of a type that inherits from ToolStripDropDownItem, such as a ToolStripMenuItem or ToolStripDropDownButton. Then name the instance ToolStripDropDownItem1 and ensure that the event handler is associated with the DropDownOpening event.

C#

private void ToolStripDropDownItem1_DropDownOpening(Object sender, EventArgs e) {

   MessageBox.Show("You are in the ToolStripDropDownItem.DropDownOpening event.");
}

Remarks

For more information about handling events, see Handling and Raising Events.

Applies to