DataGridViewColumnCollection.CollectionChanged Event

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Source:

DataGridViewColumnCollection.cs

Occurs when the collection changes.

C#

public event System.ComponentModel.CollectionChangeEventHandler? CollectionChanged;

Event Type

CollectionChangeEventHandler

Examples

The following code example demonstrates the use of this member. In the example, an event handler reports on the occurrence of the CollectionChanged 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 type DataGridViewColumnCollection named DataGridViewColumnCollection1. Then ensure that the event handler is associated with the CollectionChanged event.

C#

private void DataGridViewColumnCollection1_CollectionChanged(Object sender, CollectionChangeEventArgs e) {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "Action", e.Action );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "Element", e.Element );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "CollectionChanged Event" );
}

Remarks

Examples of collection changes include additions or removals of columns.

For more information about how to handle events, see Handling and Raising Events.

Applies to

See also

• DataGridView
• DataGridViewColumn