Can you create an event in a user control, if so, how?

I have created a User Control containing a DatePicker and I want create an event in the user control linking to the DatePicker DateChanged e开发者_运维知识库vent. This custom user control will be used in an itemscontrol.

Yes. Add a public event to the control. And then add a method that looks for delegates attached to the event. If there are any delegates, raise the event. Here's an example:

In the User Control:

public partial class Controls_UserComments : System.Web.UI.UserControl
{
    // the event delegates may listen for
    public event EventHandler CommentEditing;

    protected void Page_Load(object sender, EventArgs e)
    {
    // handle an event in the user control and bubble the event up to any delegates
        GridView_Comments.RowCancelingEdit += new GridViewCancelEditEventHandler(GridView_Comments_RowCancelingEdit);
    }

    void GridView_Comments_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView_Comments.EditIndex = -1;
        GridView_Comments.DataBind();

        // raise the event for attached delegates
        if (CommentEditing != null)
            CommentEditing(this, EventArgs.Empty);
    }
}

Now, in the web form utilizing the user control:

<ppc:UserComments ID="UserComments_ObservationComments" runat="server"
    OnCommentEditing="RefreshComments"
    />

Good luck!