using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
 
namespace DynamicControlLoading
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
      protected System.Web.UI.WebControls.Button Button1;
      protected System.Web.UI.WebControls.Panel Panel1;
      protected System.Web.UI.WebControls.Button Button2;
 
      public Int32 Count
      {
         get 
         {
            if (ViewState["count"] == null)
               ViewState["count"] = 0;
            return Int32.Parse(ViewState["count"].ToString());
         }
         set
         {
            ViewState["count"] = value;
         } 
      }
		private void Page_Load(object sender, System.EventArgs e)
		{
         if (IsPostBack)
         {
            if (ViewState["mode"].ToString() == "1")
               Response.Write("clicked");
         }
         else
         {
            ViewState.Add("mode", "0");
            Count = 0;
         }
		}
 
		#region Web Form Designer generated code
 
      override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
 
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
         this.Button1.Click += new System.EventHandler(this.Button1_Click);
         this.Button2.Click += new System.EventHandler(this.Button2_Click);
         this.Load += new System.EventHandler(this.Page_Load);
      }
 
      protected override void LoadViewState(object savedState)
      {
         base.LoadViewState(savedState);
         if (ViewState["mode"].ToString() == "1")
            AddTextBox();
      }
		#endregion
 
      private void Button2_Click(object sender, System.EventArgs e)
      {
         Count += 1;
         AddTextBox();
         ViewState.Add("mode", "1");
      }
 
      private void AddTextBox()
      {
         for (int i = 1; i <= Count; i++)
         {
            TextBox txtBox = new TextBox();
            txtBox.ID = String.Format(
               "txtBox{0}", i);
            Panel1.Controls.Add(txtBox);
         }
      }
 
      private void Button1_Click(object sender, System.EventArgs e)
      {
         int grandTotal = 0;
         /*
          * for (int i = 1; i <= Count; i++)
         {
            grandTotal += int.Parse(Request.Form[
                              String.Format("txtBox{0}", i)]);
         }
         */
         for (int i = 1; i <= Count-1; i++)
         {
            TextBox txt = (TextBox) Panel1.FindControl(
               String.Format("txtBox{0}", i));
 
            grandTotal += int.Parse(txt.Text.ToString());
         }
         Response.Write(grandTotal);
      }
	}
}