DateTimePicker.DropDown Event


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Occurs when the drop-down calendar is shown.

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

public event EventHandler DropDown

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

The following code example demonstrates handling the DropDown event of a DateTimePicker and using the MinDateTime and MaxDateTime fields. To run this example paste the following code in a form that contains a DateTimePicker named DateTimePicker1.

// When the calendar drops down, display a MessageBox indicating 
// that DateTimePicker will not accept dates before MinDateTime or 
// after MaxDateTime. Use a StringBuilder object to build the string
// for efficiency.
private void DateTimePicker1_DropDown(object sender, 
	System.EventArgs e)

	System.Text.StringBuilder messageBuilder = 
		new System.Text.StringBuilder();
	messageBuilder.Append("Choose a date after: ");
	messageBuilder.Append(" and a date before: ");

.NET Framework
Available since 1.1
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