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.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace SmartParticles
{
    public partial class WebParticleControl : System.Web.UI.UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            btnReset.Click +=new EventHandler(btnReset_Click);
            btnSubmit.Click +=new EventHandler(btnSubmit_Click);
        }
        protected void btnSubmit_Click(object sender, EventArgs e)
        {

            string _response    =   "Hello {0} {1} from {2}, {3}! Please reset the form!";
            string szState = ddlState.SelectedValue;

            lblResults.Text = string.Format(_response, txtFirstName, txtLastName, txtCity, szState);

        }

        protected void btnReset_Click(object sender, EventArgs e)
        {
            txtCity.Text = "";
            txtFirstName.Text = "";
            txtLastName.Text = "";
            ddlState.SelectedIndex = 0;
        }
    }
}