Create Dynamic Dropdownlist Controls and related event

[MaryamSh]

Create Dynamic Dropdownlist Controls and related event
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Hi,
I am creating a Dynamic Search in my application.
I create a user control and in Page_load event I create a dynamic dropdownlist and 2 dynamic button (Add,Remove)
By pressing Add button ,another row will be created with the same control (I mean another dropdown and 2 button) and so on.
and by pressing Remove button the selecetd row will be removed.

I used viewstate to keep my value for postback,

I want by changing selectedvalue of dropdownlist ,create another dynamic dropdown and textbox. so far my code is working but when I click "Add" button to create another row ,I lost my second dropdownlist and textbox.

I don not know where should I fire my SelectedValue event,to keep all control on form ,by each postback I have all my control except controls that are created by selectedvalechange event

Here is all my code.

any idea???

 
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;
using AjaxControlToolkit;
namespace LangleySunWorx.Controls
{
    public partial class WorkOrderSearch : System.Web.UI.UserControl
    {
        int number = 1;
        int j = 0;
        DropDownList[] _SearchByArray = new DropDownList[20]; //SearchBy Dropdown List
        DropDownList[] _FilterByArray = new DropDownList[20]; //FilterBy DropDown List
 
        DropDownList[] _DdlValueArray = new DropDownList[20]; //for fields which are drop and selected from SearchBy
        TextBox[] _TxtValueArray = new TextBox[20];//for fields which are text and selected from SearchBy
        TextBox[] _TxtDateValueArray = new TextBox[20];//for fields which are Date and selected from SearchBy
        Image[] _ImgBtnCalendarArray = new Image[20];//Image for fields which are Date and selected from SearchBy
        CalendarExtender[] _CalendarExtenderArray = new CalendarExtender[20];
        DropDownExtender[] _DropDownExtenderArray = new DropDownExtender[20];
        Button[] _BtnAddArray = new Button[20];
        Button[] _BtnRemoveArray = new Button[20];
 
 
 
        public string [] SearchByText= new string[] { 
                "Txt_Order#","Cmb_Job#", "Cmb_Status", "Dat_Date Created","Dat_Date Required",
                "Dat_Date Started","Dat_Date Completed","Txt_Pole#","Txt_House#","Txt_Location",
                "Txt_Priority","Txt_Parent Order#","Txt_System User","Txt_Originator","Cmb_Originator Type",
                "Txt_Originator Name","Cmb_Problem Code","Cmb_Billing Rate","Cmb_City Area","Txt_Map Reference",
                "Txt_Occurence#","Cmb_Request Locates","Cmb_Request Permits","Cmb_Restoration","Cmb_Police Services" };
 
        public string[] SearchByValue= new string[] { 
                "WorkorderID","JobID", "StatusID", "DateCreated","DateRequired",
                "DateStarted","DateCompleted","PoleNumber","HouseNumber","Location",
                "PriorityID","ParentWorkOrderID","SystemUserID","OriginatorID","OriginatorType",
                "OriginatorName","ProblemCodeID","BillingRateID","CityArea","MapReference",
                "OccurenceNumber","flagRequestLocates","flagRequestPermits","flagIsRestoration","flagPoliceServices" };
 
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                InsertComponet(number);
                ViewState.Add("Counter", number);
            }
        }
 
 
        protected void InsertComponet(int Index)
        {
            InsertRow(Index);
            FillSearchBy(Index);
            _SearchByArraySelectedIndexChanged(_SearchByArray[Index], EventArgs.Empty);
            FillFilterBy(Index);
            FillAddRemoveButton(Index);
            ViewState["controlsadded"] = true;
            ViewState["Counter"] = Index;
 
        }
        protected void InsertRow(int RowNumber)
        {
            HtmlTableRow tRow = new HtmlTableRow();
            HtmlTableCell[] _CellArray = new HtmlTableCell[6];
 
            for (int i = 0; i <= 5; i++)
            {
                _CellArray[i] = new HtmlTableCell();
 
            }
 
            tRow.Height = "50";
            tRow.VAlign = "Middle";
            Table11.Rows.Insert(RowNumber, tRow);
            Table11.Rows[RowNumber].Cells.Insert(0, _CellArray[0]);
            Table11.Rows[RowNumber].Cells.Insert(1, _CellArray[1]);
            //Table11.Rows[RowNumber].Cells[1].InnerText = "Search By ";
            Table11.Rows[RowNumber].Cells.Insert(2, _CellArray[2]);
            //Table11.Rows[RowNumber].Cells[2].InnerText = "Filter By ";
            Table11.Rows[RowNumber].Cells.Insert(3, _CellArray[3]);
            Table11.Rows[RowNumber].Cells.Insert(4, _CellArray[4]);
            Table11.Rows[RowNumber].Cells.Insert(5, _CellArray[5]);
 
        }
        protected void DeleteRow(int RowNumber)
        {
            HtmlTableRow tRow = new HtmlTableRow();
            Table11.Rows.RemoveAt(RowNumber);
 
        }
        protected void FillSearchBy(int Index)
        {
            _SearchByArray[Index] = new DropDownList();
            _SearchByArray[Index].ID = "_SearchByArray" + Convert.ToString(Index);
            _SearchByArray[Index].Width = 150;
            _SearchByArray[Index].AutoPostBack = true;
            _SearchByArray[Index].Items.Clear();
            for (int i = 0; i <= SearchByText.Length - 1; i++)
            {
                _SearchByArray[Index].Items.Add(new ListItem(SearchByText[i].Substring(4), SearchByValue[i]));
            }
            _SearchByArray[Index].SelectedIndexChanged += new System.EventHandler(this._SearchByArraySelectedInd  exChanged);
            Table11.Rows[Index].Cells[1].Controls.Add(_SearchByArray[Index]);
 
            //_DropDownExtenderArray[Index] = new AjaxControlToolkit.DropDownExtender();
            //_DropDownExtenderArray[Index].ID = "_DropDownExtenderArray" + Convert.ToString(Index); ;
            //_DropDownExtenderArray[Index].TargetControlID = "_SearchByArray" + Convert.ToString(Index);
            //Table11.Rows[Index].Cells[1].Controls.Add(_DropDownExtenderArray[Index]);
 
 
        }
        protected void FillFilterBy(int Index)
        {
            _FilterByArray[Index] = new DropDownList();
            _FilterByArray[Index].ID = "_FilterByArray" + Convert.ToString(Index);
            _FilterByArray[Index].Width = 150;
            _FilterByArray[Index].AutoPostBack = true;
            _FilterByArray[Index].Items.Clear();
            Table11.Rows[Index].Cells[2].Controls.Add(_FilterByArray[Index]);
        }
        protected void FillAddRemoveButton(int Index)
        {
            _BtnAddArray[Index] = new Button();
            _BtnAddArray[Index].ID = "_BtnAddArray" + Convert.ToString(Index);
            _BtnAddArray[Index].CssClass = "button";
            _BtnAddArray[Index].Text = "ADD";
            _BtnAddArray[Index].Width = 60;
            _BtnAddArray[Index].Click += new System.EventHandler(this._BtnADDClickHandler);
 
            Table11.Rows[Index].Cells[4].Controls.Add(_BtnAddArray[Index]);
 
            _BtnRemoveArray[Index] = new Button();
            _BtnRemoveArray[Index].ID = "_BtnRemoveArray" + Convert.ToString(Index);
            _BtnRemoveArray[Index].Text = "Remove";
            _BtnRemoveArray[Index].Width = 60;
            _BtnRemoveArray[Index].CssClass = "button";
            _BtnRemoveArray[Index].Click += new System.EventHandler(this._BtnRemoveClickHandler);
            Table11.Rows[Index].Cells[4].Controls.Add(_BtnRemoveArray[Index]);
 
 
        }
 
        //Dynamic Events
        protected void _SearchByArraySelectedIndexChanged(object sender, EventArgs e)
        {
            int SelectedItem = 0;
            SelectedItem = Convert.ToInt32(((DropDownList)sender).ID.Substrin  g(((DropDownList)sender).ID.Length - 1, 1));
 
            switch (SearchByText[((DropDownList)sender).SelectedIndex].Substring(0, 3))
            {
                case "Txt":
                    _TxtValueArray[SelectedItem] = new TextBox();
                    _TxtValueArray[SelectedItem].ID = "_TxtValueArray" + Convert.ToString(SelectedItem);
                    _TxtValueArray[SelectedItem].Text = SearchByText[((DropDownList)sender).SelectedIndex].Substring(4);
                    _TxtValueArray[SelectedItem].Width = 150;
                    Table11.Rows[SelectedItem].Cells[3].Controls.Add(_TxtValueArray[SelectedItem]);
                    break;
                case "Cmb":
                    _DdlValueArray[SelectedItem] = new DropDownList();
                    _DdlValueArray[SelectedItem].ID = "_DdlValueArray" + Convert.ToString(SelectedItem);
                    _DdlValueArray[SelectedItem].Width = 150;
                    Table11.Rows[SelectedItem].Cells[3].Controls.Add(_DdlValueArray[SelectedItem]);
                    break;
                case "Dat":
                    //Create TextBox for Date
                    _TxtDateValueArray[SelectedItem] = new TextBox();
                    _TxtDateValueArray[SelectedItem].ID = _TxtDateValueArray + Convert.ToString(SelectedItem);
                    Table11.Rows[SelectedItem].Cells[3].Controls.Add(_TxtDateValueArray[SelectedItem]);
 
                    //Create Image for Calendar Image
                    _ImgBtnCalendarArray[SelectedItem] = new Image();
                    _ImgBtnCalendarArray[SelectedItem].ID = "_ImgBtnCalendarArray" + Convert.ToString(SelectedItem);
                    _ImgBtnCalendarArray[SelectedItem].ImageUrl = "~/imgs/Calendar.ico";
                    Table11.Rows[SelectedItem].Cells[3].Controls.Add(_ImgBtnCalendarArray[SelectedItem]);
 
                    //Create CalendarExtender
                    _CalendarExtenderArray[SelectedItem] = new AjaxControlToolkit.CalendarExtender();
                    _CalendarExtenderArray[SelectedItem].ID = "_CalendarExtenderArray"+ Convert.ToString(SelectedItem);
                    _CalendarExtenderArray[SelectedItem].TargetControlID = _TxtDateValueArray + Convert.ToString(SelectedItem);
                    _CalendarExtenderArray[SelectedItem].CssClass = "RedCalendar";
                    _CalendarExtenderArray[SelectedItem].Format = "d";
                    _CalendarExtenderArray[SelectedItem].PopupButtonID = "_ImgBtnCalendarArray" + Convert.ToString(SelectedItem);
                    Table11.Rows[SelectedItem].Cells[3].Controls.Add(_CalendarExtenderArray[SelectedItem]);
                    break;
            }
            }
        public void _BtnADDClickHandler(object sender, System.EventArgs e)
        {
            number = (int)ViewState["Counter"];
            number += 1;
            InsertComponet(number);
            Label1.Text = Convert.ToString(number);
        }
 
        public void _BtnRemoveClickHandler(object sender, System.EventArgs e)
        {
            number = (int)ViewState["Counter"];
            number -= 1;
            ViewState["Counter"] = number;
 
            int SelectedItem = 0;
            SelectedItem = Convert.ToInt32(((Button)sender).ID.Substring(((Bu  tton)sender).ID.Length - 1, 1));
            DeleteRow(SelectedItem);
            Label1.Text = Convert.ToString(number);
        }
 
 
        protected override void LoadViewState(object savedState)
        {
            base.LoadViewState(savedState);
            if (ViewState["controsladded"] == null)
 
                j =(int) ViewState["Counter"] ;
                for (int i = 1; i <=j ; i++)
                {
                    InsertComponet(i);
                }
        }
 
 
    }
}