.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
Gaurav Pal
Post New Web Links

Dynamic DropDownList ListItemCollection - Event Handler

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :ASP.Net
Hi and thanks in advance. Description: I am building drop downs dynamically then adding them to a panel, when postback occurs it does not hit my event handler. However I CAN get the event handler to be hit if I remove(comment out) the properties DataTextField and DataValueField while I am rebuilding the dropdownlist within OnInit on eachpostback. However when the dropdownlist is in this condition the sender to the eventhandler does not have it's properties like SelectedValue[Index] set. Step 1: Build and load a drop down. The following is the event handler for selectedindexchanged on the lists.  The drop down list is bound to a ListItemCollection that represent a few fields from a datatable. This dropdown is loaded into a panel and the panel in turn is loaded into a div. All of this functions as intended.protected void AnswerDDL_SelectedIndexChanged(object sender,EventArgs e) { int _nextQuestionID; DropDownList _ddlSender = new DropDownList(); _ddlSender = (DropDownList)sender; _nextQuestionID = Convert.ToInt32(_ddlSender.SelectedValue); DropDownList _newAnswerDDL = new DropDownList(); _newAnswerDDL = GetAnswerDropDown(_nextQuestionID); this.m_panel.Controls.Add(_ne

View Complete Post

More Related Resource Links

How to add dynamic event handler coding.

hello i have create a full dynamic search page in table..i have created all labels, textboxs, buttons and calender Extender dynamically. now i want to get data from database on Button click event.the code is given here:-public partial class Database_DbOrderview : System.Web.UI.Page {     public SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Mydbcs"].ConnectionString);     SqlDataAdapter adp = new SqlDataAdapter("", "");     SqlCommandBuilder cbi = new SqlCommandBuilder();     DataSet ds = new DataSet();     protected void Page_Load(object sender, EventArgs e)     {              }     protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)     {           if (RadioButtonList1.SelectedValue == "Date")           {               DateDynamicTable();           } public partial class Database_DbOrderview : System.Web.UI.Page{    public SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Mydbcs"].ConnectionString);    SqlDataAdapte

Dynamic event handler in VB not responding to click event


 Hi Everyone-

This event handler is not responding at all to the click event.  On click, the pagination numbers disappear and I'm not able to trace it in the debugger because the event handle doesn't even fire so I have no idea what's going on.

 Can someone please tell me why? Thanks in advance for your help!


'Create paging control
        For i As Integer = 0 To ((RowCount / 3) - 1)
            Dim lnk As New LinkButton()
            lnk.ID = "lnkPage" & (i + 1).ToString()
            AddHandler lnk.Click, AddressOf lbl_Click
            lnk.Text = (i + 1).ToString()
            Dim spacer As New Label()
            spacer.Text = " "
        Next i

Private Sub lbl_Click(ByVal sender As Object, ByVal e As EventArgs)
        'for pagination on repeater
        Dim lnk As LinkButton = TryCast(sender, LinkButton)
        Dim currentPage As Integer = Integer.Parse(lnk.Text)
        Dim take As Integer = currentPage * 3
        Dim skip As Integer = If(currentPage = 1, 0, take - 3)
        FetchData(take, skip)
    End Sub


bind event handler for dynamic controls in repeater



I am faceing following problem


I have a repeater control on a modal popup extender. On run time I add linkbutton based on the number of items in a datatable assigned to that repeater control.In itemDataBound event of repeater I am adding that link button, like this


if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
                LinkButton lbtn = new LinkButton();
                lbtn.ID = "lbtn" + DataBinder.Eval(e.Item.DataItem, "DatasourceId").ToString();
                lbtn.Text = DataBinder.Eval(e.Item.DataItem, "DatasourceName").ToString();

                lbtn.Click += new EventHandler(lbtn_Click);



but this linkbutton event is not getting fired on click. only the modal popup goes off.

I tried with command also for linkbutton instead of Click event handler. But that also did not help.


Creating Event Handler in Code behind


Hi, so I have a control that is created in the code behind and generates fine but I can't figure out how to create an event handler for it.  I've found plenty of examples for it in C sharp, but none of them seem to apply to VB.  What I want to do is essentially this:

myDropDownList.SelectedIndexChanged = "Event to do here"

but it doesn't seem to work for me.

Any suggestions are appreciated.

want to launch modal Popup from created User Event handler




I have a create user wizard on my page and in the event handler (Created User) I get extra information from the user

via textboxes within the aspx etc.


I then do a response.redirect to another page.

What I want to happen is this


When the CreatedUser Event is fired, I  want a Modal Popup to show up with a message Processing your registration.

once the registration code is processed it will close and the users get redirected.


On my ASPX I have the Modal PopUp and a Panel.

In the code behind in the handler I put ModalPop.show()


but this does not work.


thanks for any suggestions



InfoPath Workflow Task Form "Loading" event handler only being called after App Pool recycled.


I have a Workflow that is using an InfoPath task form.  In the "FormEvents_Loading" method event handler I have some code that needs to run each time the form is opened.   I recycle the App Pool and open the form the code runs perfectly, but if I close and try to re-open the form the code is not run at all.  I can then recycle the App Pool again and on the next load the code executes just fine.   The code that is supposed to be run is a very simple statement to set a field value, so I don't think it is interfering.

Does anyone know what this might be?


Event Handler Credentials


I made EH that checks out document when OOB Approval WF is finished successfully.

I want doc to be checked out by WF Initiator, but by default it is made by System Account.

How can i change Event Handler Account ?

Pre_Init event handler problem


Hi all my friends

   I have to masterpages for my home page.

1. The first is for the annonymous users which has the login controls. its name is General_Anonymous.master.

2. The second one is for the logged in users which has a logout button and it hasn't the login controls in it. its name is General_LoggedIn.master.

in my default.aspx page I wrote the following code

protected void Page_PreInit(object sender, EventArgs e)
            if (Session["SupId"] == null && Session["CustomerId"] == null)
                this.MasterPageFile = "~/Masters/General_Anonymous.master";
                this.MasterPageFile = "~/Masters/General_LoggedIn.master";

ListItem Dynamic DropDownList based on custom list entries.

I utilized the following solution to get the drop down list on the page and populate it dynamically, but it doesn't save the selected value back to the SPListItem object. Does anyone have a better solution possibly for this? http://geekswithblogs.net/SoYouKnow/archive/2010/01/21/sharepoint-populating-drop-down-list-field-with-data-from-different.aspx

Event Handler & AD

My event handler is working fine until i add AD part. After this string it stops firing at all: DirectoryEntry dom = new DirectoryEntry(); I mean it compiles, deploys and doesnt react to anything ( Why ? PS VS2010, SP2010  

how to get values of list item being entered in ItemAdding event handler?

Hi,          i am trying to get the values being entered in a listitem in the ItemAdding eventhandler as follows, but it doesnt work. public override void ItemAdding(SPItemEventProperties properties)         {             base.ItemAdding(properties);             SPSite CurrentSite = new SPSite("http://mm-moss/np/");             SPWeb CurrentWeb = properties.OpenWeb();             SPList CurrentList = CurrentWeb.Lists[properties.ListId];             string vehicleNo = CurrentList.Items[CurrentList.Items.Count - 1]["Vehicle No"].ToString();             string  name=CurrentList.Items[CurrentList.Items.Count-1]["Name"].ToString(); } when i debug i cant get hold of the VehicleNo value. canyone help me in getting the values of the list item being entered? Thank you all.

Create a meeting instance with an event handler

Hi, i want to know if its posible to insert a new meeting instance in a meeting workspace automatically when you add a new event in a calendar.   i try to pass automatically the option of the template selection.   its posible with the objetc model or web services?   thanks

Event handler that will take an e-mail sent to a doc library and save it as an .MSG file within the

Hi All, I have a requirement to create an event handler that will take an e-mail sent to a doc library and save it as an .MSG file within the library? Any help/inputs on getting this done is much appreciated.  Hanif

Sharepoint Event Handler not firing

I have written an event handler for an ItemAdded eventfor a document library. I am trying to read an excel file being uploaded and extract a value from it which I write to a list column for the item. I have this working properly on my development machine which is a Windows Server 2003 machine.However, on a production Windows Server 2008 machine, the event handler never fires. I am doing a simple write to a log file to test and see if it runs at all even if the Excel parsing does not work but I get no indication that it ran. The event handler is being registered with a feature that I am deploying. I have verified that the event handler is registered to the library by using the u2u Event Handler Explorer tool.Is there any way I can determine if my event handlers are even executing? How can I debug this?

ItemAdded Event Handler not firing

Hi, I have created an ItemAdded Event handler that is linked to a content type. This event handler does certain custom validations and then sends Email to users. I have referenced this event handler in XML file as well but somehow the event handler is not getting fired...Following is the code.   Code Snippet            this.DisableEventFiring();            using (SPSite site = new SPSite(properties.SiteId))            {                 using (SPWeb web = site.OpenWeb())                {                    base.ItemAdding(properties);                     SPList nList = web.Lists["NList"];                    SPList IList = web.Lists["IList"];                     foreach (SPListItem listItem in nList.Items)                    {                        if (listItem["Topic"].ToString() == properties.ListItem["Topic"].ToString())                        {                            SPUser alertUser = (SPUser)(properties.ListItem["SUser"]);                            SPUtility.SendEmail(web, false, true,alertUser.Email,"New item added", "A new item has been added");                         }                    }                    this.EnableEventFiring();                }            }       The XML file is: Code Snippet  <XmlDocuments>      <XmlDocument NamespaceURI="http://schemas.microsoft.com/

Event Handler not picking up error

I have a connection manager which uses a Variable as part of a ConnectionString. I have tried putting an Event handler on the package to capture any errors with the connection string. Unfortunately the event handler does not pick up any errors. I would like to add some screenshot but i am not sure how to do it on this forum.  Mr Shaw

Get dropdownlist event OnSelectedIndexChange using jquery

I have dropdownlist that located inside a repeater, how can i get OnSelectedIndexChange event of this dropdownlist? i want to use this event to set TextBox value olso inside this repeater, i try this code$("#Table1> tbody > tr ").each(function() { var rowId = $(this).attr("id"); $(this).find("td > #DropDownList1").change(function() { $("#" + rowId + "> TD:nth-child(6) > input[name$='TextBox1']").val("Test"); }); }); But did not work, can anyone please help me?
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend