unable to generate dynamic code for Update panel in user control

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C#

user-controls

UpdatePanel

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I m trying to generate updatepanel dynamically on user controll so that i can use that user control on other pages. But the update panel is not working properly on user control. I searched on google but didnt get any desired output. My Script manager is on Master Page.
Exception is :
1. The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

m.Invoke(ScriptManager.GetCurrent(Page), new object[] { panel});
the above syntax is returning the null value.


here is my code....

--Code start here

 static int iValue = 0;
       static Panel[] pnlAttactCondition = new Panel[1];

       private void Add_Panel(Panel pnlTemp)
       {
           try
           {
               foreach (Control item in pnlTemp.Controls)
               {
                   if (item is CheckBox)
                   {
                       (item as CheckBox).CheckedChanged += new EventHandler(cboxAge_CheckedChanged);
                   }
                   if (item is RadioButtonList)
                   {
                       (item as RadioButtonList).SelectedIndexChanged += new EventHandler(rblInformationType_SelectedIndexChanged);
                   }
                   if (item is Button)
                   {
                       (item as Button).Click += new EventHandler(btnCancel_Click);
                   }
                   if (item is UpdatePanel)
                   {
                       (item as UpdatePanel).Unload += new EventHandler(UpdatePanel_Unload);
                   }
               }
               pnlMainConditions.Controls.Add(pnlTemp);
               pnlMainConditions.Controls.Add(new LiteralControl("<br>"));
           }
           catch (Exception)
           {
               throw;
           }
       }

       private Panel GenerateControls(string strtemp)
       {
           Panel pnlCondition = null;
           RadioButtonList rblInformationType =null;
           TextBox txtPercentage=null;
           TextBox txtFixedAmount=null;
           TextBox txtMinimumAmount=null;
           TextBox txtMaximumAmount=null;
           TextBox txtFormula = null;
           TextBox txtStartAge = null;
           TextBox txtEndAge = null;
           CheckBox cboxAge = null;
           Label lblAmountType = null;
           Label lblMinimumAount = null;
           Label lblMaximumAmount = null;
           Label lblStartAge = null;
           Label lblEndAge = null;
           Button btnCancel = null;
           UpdatePanel uppnlTemp = null;
           try
           {
               iValue++;
               pnlCondition = new Panel();
               rblInformationType = new RadioButtonList();
               txtPercentage = new TextBox();
               txtFixedAmount = new TextBox();
               txtFormula = new TextBox();
               txtMinimumAmount = new TextBox();
               txtMaximumAmount = new TextBox();
               txtStartAge = new TextBox();
               txtEndAge = new TextBox();
               cboxAge = new CheckBox();
               lblAmountType = new Label();
               lblMinimumAount = new Label();
               lblMaximumAmount = new Label();
               lblStartAge = new Label();
               lblEndAge = new Label();
               btnCancel = new Button();
               uppnlTemp = new UpdatePanel();

               rblInformationType.RepeatDirection = RepeatDirection.Horizontal;
               rblInformationType.Items.Add("Percentage");
               rblInformationType.Items.Add("Fixed Amount");
               rblInformationType.Items.Add("Formula");
               rblInformationType.ClientIDMode = ClientIDMode.Static;
               rblInformationType.ID = "rblInformationType_" + Convert.ToString(iValue);
               rblInformationType.SelectedIndexChanged += new EventHandler(rblInformationType_SelectedIndexChanged);
               rblInformationType.AutoPostBack = true;

               txtPercentage.ClientIDMode = ClientIDMode.Static;
               txtPercentage.ID = "txtPercentage_" + Convert.ToString(iValue);
               txtPercentage.Width = 240;
               txtPercentage.CssClass = "inputs";

               txtFixedAmount.ClientIDMode = ClientIDMode.Static;
               txtFixedAmount.ID = "txtFixedAmount_" + Convert.ToString(iValue);
               txtFixedAmount.Width = 240;
               txtFixedAmount.CssClass = "inputs";

               txtFormula.ClientIDMode = ClientIDMode.Static;
               txtFormula.ID = "txtFormula_" + Convert.ToString(iValue);
               txtFormula.Width = 240;
               txtFormula.CssClass = "inputs";

               txtMinimumAmount.ClientIDMode = ClientIDMode.Static;
               txtMinimumAmount.ID = "txtMinimumAmount_" + Convert.ToString(iValue);
               txtMinimumAmount.Width = 240;
               txtMinimumAmount.CssClass = "inputs";

               txtMaximumAmount.ClientIDMode = ClientIDMode.Static;
               txtMaximumAmount.ID = "txtMaximumAmount_" + Convert.ToString(iValue);
               txtMaximumAmount.Width = 240;
               txtMaximumAmount.CssClass = "inputs";

               txtStartAge.ClientIDMode = ClientIDMode.Static;
               txtStartAge.ID = "txtStartAge_" + Convert.ToString(iValue);
               txtStartAge.Width = 240;
               txtStartAge.CssClass = "inputs";

               txtEndAge.ClientIDMode = ClientIDMode.Static;
               txtEndAge.ID = "txtEndAge_" + Convert.ToString(iValue);
               txtEndAge.Width = 240;
               txtEndAge.CssClass = "inputs";

               cboxAge.ClientIDMode = ClientIDMode.Static;
               cboxAge.ID = "cboxAge_" + Convert.ToString(iValue);
               cboxAge.Text = "Is Age Factor applicable for this condition";
               cboxAge.CheckedChanged += new EventHandler(cboxAge_CheckedChanged);
               cboxAge.AutoPostBack = true;

               lblAmountType.Text = string.Empty;
               lblAmountType.ID = "lblAmountType_" + Convert.ToString(iValue);
               lblAmountType.ClientIDMode = ClientIDMode.Static;

               lblMinimumAount.Text = "Minimum Amount";
               lblMinimumAount.ID = "lblMinimumAmount_" + Convert.ToString(iValue);
               lblMinimumAount.ClientIDMode = ClientIDMode.Static;

               lblMaximumAmount.Text = "Maximum Amount";
               lblMaximumAmount.ID = "lblMaximumAmount_" + Convert.ToString(iValue);
               lblMaximumAmount.ClientIDMode = ClientIDMode.Static;

               lblStartAge.Text = "Age From";
               lblStartAge.ID = "lblStartAge_" + Convert.ToString(iValue);
               lblStartAge.ClientIDMode = ClientIDMode.Static;

               lblEndAge.Text = "Age Upto";
               lblEndAge.ID = "lblEndAge_" + Convert.ToString(iValue);
               lblEndAge.ClientIDMode = ClientIDMode.Static;

               btnCancel.Text = "Cancel";
               btnCancel.ClientIDMode = ClientIDMode.Static;
               btnCancel.ID = "btnCancel_" + Convert.ToString(iValue);
               btnCancel.CssClass = "bluebtn";
               btnCancel.Click += new EventHandler(btnCancel_Click);

               uppnlTemp.ID = "uppnlTemp_" + Convert.ToString(iValue);
               uppnlTemp.ClientIDMode = ClientIDMode.Static;
               uppnlTemp.UpdateMode = UpdatePanelUpdateMode.Conditional;
               //uppnlTemp.Unload += new EventHandler(UpdatePanel_Unload);
               uppnlTemp.ContentTemplateContainer.Controls.Add(rblInformationType);

               pnlCondition.ClientIDMode = ClientIDMode.Static;
               pnlCondition.ID = "pnlCondition_" + Convert.ToString(iValue);
               pnlCondition.BorderColor = Color.Gray;
               pnlCondition.BorderWidth = 5;
               pnlCondition.ToolTip = strtemp;

               pnlCondition.Controls.Add(new LiteralControl("<table><tr><td> Select Any One </td><td>"));
               pnlCondition.Controls.Add(uppnlTemp);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr>"));
               pnlCondition.Controls.Add(new LiteralControl("<br/>"));
               pnlCondition.Controls.Add(new LiteralControl("<tr><td>"));
               pnlCondition.Controls.Add( lblAmountType );
               pnlCondition.Controls.Add(new LiteralControl("</td><td>"));
               pnlCondition.Controls.Add(txtPercentage);
               pnlCondition.Controls.Add(txtFixedAmount);
               pnlCondition.Controls.Add(txtFormula);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr>"));
               pnlCondition.Controls.Add(new LiteralControl("<tr><td>"));
               pnlCondition.Controls.Add(lblMinimumAount);
               pnlCondition.Controls.Add(new LiteralControl("</td><td>"));
               pnlCondition.Controls.Add(txtMinimumAmount);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr><tr><td>"));
               pnlCondition.Controls.Add(lblMaximumAmount);
               pnlCondition.Controls.Add(new LiteralControl("</td><td>"));
               pnlCondition.Controls.Add(txtMaximumAmount);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr><tr><td>"));
               pnlCondition.Controls.Add(cboxAge);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr><tr><td>"));
               pnlCondition.Controls.Add(lblStartAge);
               pnlCondition.Controls.Add(new LiteralControl("</td><td>"));
               pnlCondition.Controls.Add(txtStartAge);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr><tr><td>"));
               pnlCondition.Controls.Add(lblEndAge);
               pnlCondition.Controls.Add(new LiteralControl("</td><td>"));
               pnlCondition.Controls.Add(txtEndAge);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr><tr></tr><tr><td></td><td>"));
               pnlCondition.Controls.Add(btnCancel);
               pnlCondition.Controls.Add(new LiteralControl("</td></tr></table>"));

               rblInformationType.SelectedIndex = 0;
               txtFixedAmount.Visible = false;
               txtFormula.Visible = false;

               cboxAge.Checked = false;
               lblStartAge.Visible = false;
               txtStartAge.Visible = false;
               lblEndAge.Visible = false;
               txtEndAge.Visible = false;

               lblAmountType.Text = "Set Percentage";

               return pnlCondition;
           }
           catch (Exception ex)
           {

               throw ex;
           }
       }

       public void RegisterUpdatePanel(UpdatePanel panel)
       {

           MethodInfo m =(from methods in typeof(ScriptManager).GetMethods(BindingFlags.NonPublic | BindingFlags.Instance)

               where methods.Name.Equals("System.Web.UI.IScriptManagerInternal.RegisterUpdatePanel")

               select methods).First<MethodInfo>();

           m.Invoke(ScriptManager.GetCurrent(Page), new object[] { panel });

       }

       protected void Page_Load(object sender, EventArgs e)
       {
           try
           {
               if (!IsPostBack)
               {
                   iValue = 0;
                   pnlAttactCondition = new Panel[1];
               }
           }
           catch (Exception ex)
           {
               throw ex;
           }
       }

       protected override void OnInit(EventArgs e)
       {
           if (pnlAttactCondition[0] is Panel)
           {
               foreach (Panel pTemp in pnlAttactCondition)
               {
                   if (pTemp != null)
                   {
                       Add_Panel(pTemp);
                   }
               }
           }

           //Page page = HttpContext.Current.Handler as Page;
           //page.Init += delegate(object sender, EventArgs e_Init)
           //{
           //    if (ScriptManager.GetCurrent(page) == null)
           //    {
           //        ScriptManager sMgr = new ScriptManager();
           //        page.Form.Controls.AddAt(0, sMgr);
           //    }
           //};
           //base.OnInit(e);
       }

       protected void UpdatePanel_Unload(object sender, EventArgs e)
       {
           try
           {
               RegisterUpdatePanel(sender as UpdatePanel);
           }
           catch (Exception ex)
           {
               throw ex;
           }
       }


protected void btnAddCondition_Click(object sender, EventArgs e)
       {
           int iIndex = iValue;
           try
           {
               if (pnlAttactCondition.Length <= iValue)
               {
                   Array.Resize(ref pnlAttactCondition, iValue + 1);
               }
               pnlAttactCondition[iIndex] = new Panel();
               pnlAttactCondition[iIndex] = GenerateControls(iIndex.ToString());
               Add_Panel(pnlAttactCondition[iIndex]);
           }
           catch (Exception ex)
           {
               throw ex;
           }
       }

---code end here