WebParticles: Developing and Using Web User Controls as WebParts in Microsoft Office SharePoint Server 2007

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;
/*
    the conditional compilation section allows 
    development
    of sharepoint parts inside ASP.NET 
*/
using Microsoft.SharePoint.WebPartPages;

namespace SmartParticles
{
    public class WebParticle: WebPart
    {
        private Control _control;
        private string _exceptions = "";
#if SHAREPOINT
        private string _userControlPath = @"~/usercontrols/";
#else
        private string _userControlPath = "";
#endif
        protected override void CreateChildControls()
        {
            base.CreateChildControls();

            
            try
            {
                string tooldir = this.Page.Request.MapPath(_userControlPath);
                string[] textArray1 = null;
                try
                {
                    textArray1 = Directory.GetFiles(tooldir);
                }
                catch (Exception exception1)
                {
                    _exceptions +=  string.Format("Could not open user control path: {0}", exception1.ToString());
                    return;
                }
                _control = this.Page.LoadControl(_userControlPath + @"webparticlecontrol.ascx");

            }
            catch (Exception CreateChildControls_Exception)
            {
                _exceptions += "CreateChildControls_Exception2: " + CreateChildControls_Exception.Message;

            }//end catch

        }//end protected override void CreateChildControls()

        protected override void RenderContents(HtmlTextWriter writer)
        {
            try
            {
                base.RenderContents(writer);
                _control.RenderControl(writer);
            }
            catch (Exception RenderContents_Exception)
            {
                _exceptions += "RenderContents_Exception: " + RenderContents_Exception.Message;
            }
            finally
            {
                if (_exceptions.Length > 0)
                {
                    writer.WriteLine(_exceptions);
                }
            }
        }
    }
}