How to retain control after post back in asp.net

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i have 2 button and creting 2 textbox on each button when i click button 1 it add 2 textbox in panel2,panel3 and when i click button 2 it add 2 textbox but in panel3 ,panel ...but problem is that when i clinck button 2 ,button 1 textbox desappear

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Web.UI.HtmlControls;

namespace FinAppCs
{
    public partial class EmiCalculater : System.Web.UI.Page
    {       
        int occor;
        int occor2;
        int Id = 0;
        HtmlTable htbl;
        HtmlTableCell Hdcl;
        HtmlTableRow Hdr;
        HtmlTableRow Hdr2;
        protected void Page_Load(object sender, EventArgs e)
        {
            //recreate();
        }
        protected void btnAdd_Click(object sender, EventArgs e)
        {
              dateamount();
            //recreate2();
        }
        protected void btnReche_Click(object sender, EventArgs e)
        {
           // recreate1();
            ratecheng();
        }
        void dateamount()
        {
            {
                int id;
                HtmlTable htbl = new HtmlTable();
                HtmlTable htbl2 = new HtmlTable();
                if (ViewState["ID"] == null)
                {
                    id = 1;
                }
                else
                {
                    id = Convert.ToInt32(ViewState["ID"]);
                }
                for (int i = 0; i < id; i++)
                {
                    Hdr = new HtmlTableRow();
                    TextBox txtIntdate = new TextBox();
                    txtIntdate.ID = "txtIntdate" + i;
                    txtIntdate.Text = Request.Form[txtIntdate.ClientID];
                    Hdcl = new HtmlTableCell();
                    Hdcl.Controls.Add(txtIntdate);
                    Hdr.Controls.Add(Hdcl);
                    htbl2.Controls.Add(Hdr);
                    Panel2.Controls.Add(htbl2);
                    //second textbox
                    Hdr = new HtmlTableRow();
                    TextBox txtAmnt = new TextBox();
                    txtAmnt.ID = "txtAmnt" + i;
                    txtAmnt.Text = Request.Form[txtAmnt.ClientID];
                    Hdcl = new HtmlTableCell();
                    Hdcl.Controls.Add(txtAmnt);
                    Hdr.Controls.Add(Hdcl);
                    htbl.Controls.Add(Hdr);
                    Panel3.Controls.Add(htbl);

                }
                id++;
                ViewState["ID"] = id;
                //htbl.Controls.Add(Hdr);
                //htbl2.Controls.Add(Hdr);
                //Panel2.Controls.Add(htbl); 
            }
        }
        void ratecheng()
        {
           // recreate();
            int id1;
            HtmlTable htbld = new HtmlTable();
            HtmlTable htbl21 = new HtmlTable();
            if (ViewState["ID1"] == null)
            {
                id1 = 1;
            }
            else
            {
                id1 = Convert.ToInt32(ViewState["ID1"]);
            }
            for (int j = 0; j < id1; j++)
            {
                Hdr2 = new HtmlTableRow();
                TextBox txtInreche = new TextBox();
                txtInreche.ID = "txtInreche" + j;
                txtInreche.Text = Request.Form[txtInreche.ClientID];
                Hdcl = new HtmlTableCell();
                Hdcl.Controls.Add(txtInreche);
                Hdr2.Controls.Add(Hdcl);
                htbl21.Controls.Add(Hdr2);
                Panel4.Controls.Add(htbl21);
                //second textbox
                Hdr2 = new HtmlTableRow();
                TextBox txtrate = new TextBox();
                txtrate.ID = "txtrate" + j;
                txtrate.Text = Request.Form[txtrate.ClientID];
                Hdcl = new HtmlTableCell();
                Hdcl.Controls.Add(txtrate);
                Hdr2.Controls.Add(Hdcl);
                htbld.Controls.Add(Hdr2);
                Panel5.Controls.Add(htbld);

            }
            id1++;
            ViewState["ID1"] = id1;
            //htbl.Controls.Add(Hdr);
            //htbl2.Controls.Add(Hdr);
            //Panel2.Controls.Add(htbl); 
           
        }
      //  void recreate1()
      //  {
      //      {
      //          int id;
      //          HtmlTable htbl = new HtmlTable();
      //          HtmlTable htbl2 = new HtmlTable();
      //          if (ViewState["ID"] == null)
      //          {
      //              id = 1;
      //          }
      //          else
      //          {
      //              id = Convert.ToInt32(ViewState["ID"]);
      //          }
      //          for (int i = 0; i < id; i++)
      //          {
      //              Hdr = new HtmlTableRow();
      //              TextBox txtIntdate = new TextBox();
      //              txtIntdate.ID = "txtIntdate" + i;
      //              txtIntdate.Text = Request.Form[txtIntdate.ClientID];
      //              Hdcl = new HtmlTableCell();
      //              Hdcl.Controls.Add(txtIntdate);
      //              Hdr.Controls.Add(Hdcl);
      //              htbl2.Controls.Add(Hdr);
      //              Panel2.Controls.Add(htbl2);
      //              //second textbox
      //              Hdr = new HtmlTableRow();
      //              TextBox txtAmnt = new TextBox();
      //              txtAmnt.ID = "txtAmnt" + i;
      //              txtAmnt.Text = Request.Form[txtAmnt.ClientID];
      //              Hdcl = new HtmlTableCell();
      //              Hdcl.Controls.Add(txtAmnt);
      //              Hdr.Controls.Add(Hdcl);
      //              htbl.Controls.Add(Hdr);
      //              Panel3.Controls.Add(htbl);

      //          }
      //          //id++;
      //          //ViewState["ID"] = id;
      //          //htbl.Controls.Add(Hdr);
      //          //htbl2.Controls.Add(Hdr);
      //          //Panel2.Controls.Add(htbl); 
      //      }
      //  }
      //void  recreate2()
      //  {
      //       {
      //          int id;
      //          HtmlTable htbl = new HtmlTable();
      //          HtmlTable htbl2 = new HtmlTable();
      //          if (ViewState["ID"] == null)
      //          {
      //              id = 1;
      //          }
      //          else
      //          {
      //              id = Convert.ToInt32(ViewState["ID"]);
      //          }
      //          for (int i = 0; i < id; i++)
      //          {
      //              Hdr = new HtmlTableRow();
      //              TextBox txtIntdate = new TextBox();
      //              txtIntdate.ID = "txtIntdate" + i;
      //              txtIntdate.Text = Request.Form[txtIntdate.ClientID];
      //              Hdcl = new HtmlTableCell();
      //              Hdcl.Controls.Add(txtIntdate);
      //              Hdr.Controls.Add(Hdcl);
      //              htbl2.Controls.Add(Hdr);
      //              Panel2.Controls.Add(htbl2);
      //              //second textbox
      //              Hdr = new HtmlTableRow();
      //              TextBox txtAmnt = new TextBox();
      //              txtAmnt.ID = "txtAmnt" + i;
      //              txtAmnt.Text = Request.Form[txtAmnt.ClientID];
      //              Hdcl = new HtmlTableCell();
      //              Hdcl.Controls.Add(txtAmnt);
      //              Hdr.Controls.Add(Hdcl);
      //              htbl.Controls.Add(Hdr);
      //              Panel3.Controls.Add(htbl);

      //          }
      //          //id++;
      //          //ViewState["ID"] = id;
      //          //htbl.Controls.Add(Hdr);
      //          //htbl2.Controls.Add(Hdr);
      //          //Panel2.Controls.Add(htbl); 
      //      }
      //  }
    }
}

Posted 31-Jul-13 20:43pm

mohdniyaz169

Updated 31-Jul-13 20:58pm

Thanks7872

v2

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Harshil_Raval · Answer 1 · 2013-07-31T23:15:00

Hi,

In asp.net when postback happen all dynamic controls disappears. To retain dynamic control you have to deal with javascript/jquery.

eg.,

JavaScript

<script>
   $('#button2').click(function(){
       var txt = document.createElement('input');
       txt.setAttribute('type', 'txt');
       txt.setAttribute('id', 'txt1');
       // finally add this txt in your target area. suppose div
       $('#div').appendChild(txt);
   });
</script>