Paris Polyzos' Blog

Let’s assume we have a control ShippingSelect.ascx and we would like to assign an event like ItemCommand.

Firstly we add a new User Control to our project (ShippingSelect.ascx) and at the code behind we need to declare the name of the event using the EventHandler<TEventArgs> where TEventArgs is an EventArgs that contains the event data.

namespace Examples.EShop
{
    public partial class ShippingSelect : System.Web.UI.UserControl
    {
        /// Create OnItemCommand event
        public event EventHandler<ShippingEventArgs> ItemCommand;

        protected void Page_Load(object sender, EventArgs e)
        {

        }
    }

    /// <summary>
    /// Event arguments for the Command Type,
    /// Address that user wants to dispatch his order
    /// and the Shipping Method user wants to use
    /// </summary>
    public class ShippingEventArgs : EventArgs
    {
        public enum CommandType { Insert, Update, Delete, Select}

        public CommandType Command { set; get; }
        public Address Address { set; get; }
        public ShippingMethod ShippingMethod { set; get; }
    }
}

Now let’s see how we can use this control and call the event we previously assigned to:

We Create a control CheckOutProcess.ascx that contains the above ShippingSelect.ascx control.

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="CheckOut.ascx.cs" Inherits="Examples.EShop.CheckOutProcess" %>
<%@ Register TagPrefix="example" TagName="ShippingSelect" Src="~/Controls/CheckOut/ShippingSelect.ascx" %>
<example:ShippingSelect ID="shippingSelect" runat="server" OnItemCommand="shippingSelectItemCommand" />

And at the code behind of CheckOutProcess.ascx we can handle the shippingSelectItemCommand

protected void shippingSelectItemCommand(object sender, ShippingEventArgs e)
{
    switch (e.Command)
    {
        case ShippingEventArgs.CommandType.Select:
        {
            //TODO: Handle Select Command
        }
        break;
    }
}