Click here to Skip to main content
14,426,138 members
Rate this:
Please Sign up or sign in to vote.
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
Posted
Updated 4-Jul-14 22:22pm
v3
Comments
gggustafson 6-Jul-14 12:17pm
   
1. cboxAge_CheckedChanged, rblInformationType_SelectedIndexChanged, and btnCancel_Click are not defined. Supply dummy methods to allow compilation, like

void btnCancel_Click ( Object sender,
EventArgs e )
{

}

2. To reduce the number of issues that may arise, reduce the number of controls that you generate in GenerateControls to one each of

Panel
RadioButtonList
TextBox
CheckBox
Label
Button
UpdatePanel

3. Where is pnlMainConditions defined?

Hope that helps.
[no name] 6-Jul-14 13:01pm
   
where have you added updatepanel from dynamic

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)




CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100