Connecting Custom Web Parts in SharePoint

using System;
using System.Runtime.InteropServices;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;
using CommunicationInterface;

namespace ConsumerWebPart
{
    [Guid("ab395c89-1146-4964-9528-f42153bf5c06")]
    public class ConsumerWebPart : System.Web.UI.WebControls.WebParts.WebPart
    {
        Label lblTitle;
        Label lblResult;

        ///// the string info consumer from custom reciever   //
        ICommunicationInterface connectionInterface = null;
        // The consumer webpart  must define a method that would accept the interface as an parameter and must be decorated with ConnectionConsumer attribute      
        [ConnectionConsumer("Parameter1 Consumer", "Parameter1 Consumer")]
        public void GetConnectionInterface(ICommunicationInterface _connectionInterface)
        {
            connectionInterface = _connectionInterface;
        }
        /////////////////////////////////////////////////////////  

        public ConsumerWebPart()
        {
            this.Title = "Consumer WebPart";
            this.ExportMode = WebPartExportMode.All;
        }

        protected override void CreateChildControls()
        {
            base.CreateChildControls();

            Table tbl;
            TableRow row;
            TableCell cell;

            // A table for layout 
            tbl = new Table();
            row = new TableRow();
            cell = new TableCell();

            // first row for title
            cell.VerticalAlign = VerticalAlign.Middle;
            cell.HorizontalAlign = HorizontalAlign.Center;
            lblTitle = new Label();
            lblTitle.Text = "This WebPart will recieve a parameter from a provider:";
            cell.Controls.Add(lblTitle);
            row.Controls.Add(cell);
            tbl.Controls.Add(row);

            //second row for result
            row = new TableRow();
            cell = new TableCell();
            cell.VerticalAlign = VerticalAlign.Middle;
            cell.HorizontalAlign = HorizontalAlign.Center;
            lblResult = new Label();
            //check the connectionInterface for recieving the parameter1
            if (connectionInterface != null)
            {
                lblResult.Text = connectionInterface.Parameter1+" is recieved!";
            }
            else
            {
                lblResult.Text = "nothing is recieved!";
            }
            cell.Controls.Add(lblResult);
            row.Controls.Add(cell);
            tbl.Controls.Add(row);

            //add table to webpart
            this.Controls.Add(tbl);           
        }
    }
}