Web Forms :: Cant Delete An Item In A Repeater. Event Validation Security?
Mar 23, 2011
I have a reorder list control from the ajax toolkit. When i click a delete button on any of the items i get this error:Server Error in '/' Application.Invalid postback or callback argument. Event validation is enabled using<pagesnableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifiesthat arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback datafor validation.Description: An unhandled exception occurred during the execution of the current web request. Please review thestack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page nableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
I have Repeater in usercontrol and Inside the repeater i have 1 itemtemplate in which i have ImageButton on it. Also i am handling the Click event on the Imagebutton using ItemCommand of the Repeater. when i click the image button it fires the item_command on the codebehind which is fine. But if i use !Ispostback on page load to stop loadinghte databind event again which is in pageload, it's not firing the Item_Command Event.
If i remove the !Ispostback from my page it's doing the pageload event againt which has calling my databind method and then it calls the Item_commands event. Wondering is this kentico issue or usercontrol problem?
I am using one datalist control for uploading multiple images.I hv used one Asp:FileUplaod Control and one button in one itemtemplate.I am using reqired field validator and regular expression validator for file upload cntrl I am assigning validation group for both of them on ItemDataBound event of my datalist so that each upload cntrl hv same validaton group as required field and regular expression validator.Now what i want to do is - i want to show my error message in validation summary which is right at the top of the page.I want one know how to write javascript that will assign validation group of my control in datalist on which i click ?
I have a repeater control. show my products. in the quantity column I have a textbox that fills from database, the problem is when I want to update the quantity from the textbox, how to get the id of the row repeater and the value of the textbox to update the record. try using the method OnTextChanged. or maybe Jquery?.
I'm having trouble managing how to call upon databind from clicking on a row over an already populated repeater that will populate data regarding the row clicked TO another repeater on the same page.
I've succeeded doing that with postback, calling a jquery click event of that row, taking the data of the specific row and passing it onto a "Querystring" and after postpack, it will be pushed into a Session which the ObjectDataSource of the secondary repeater will recognize and populate the data tables accordingly.
The problem is, I must do it without a postback or in other words purely on client side.
last year I inherited a webapplication that seems to refuse to run on a new hosting company's servers due to a "security violation"... Our old host was bought out and now sucks...So I uploaded the code to the new company - looking forward to some sleep and found that my life was about to get more complex.. I go the good old generic security error
The biggest issue was that it didn't say where the error was.. Digging deeper (taking the code appart one block a time) the error was being triggered by the followin itemdatabound event. My host says it is because they are running under medium trust, but I am not seeing why this block should cause issues. Any help very much appreciated.
Sub dlstAlsoDish_ItemDataBound(ByVal s As Object, ByVal e As DataListItemEventArgs) Handles dlstAlsoDish.ItemDataBound If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then Dim lngDateType As Long = e.Item.DataItem("dateType")Dim strEvent As String = "> " & e.Item.DataItem("restName") & " :: " & e.Item.DataItem("eventName") & " : " Dim lnkAlsoEvent As HyperLink = e.Item.FindControl("lnkAlsoEvent")Dim dtmStart As DateTime = e.Item.DataItem("eventSrt")Dim dtmEnd As DateTime = e.Item.DataItem("eventEnd")If lngDateType = 1 Then strEvent = strEvent & Format(dtmStart, "MMM")ElseIf lngDateType = 2 Then strEvent = strEvent & Format(dtmStart, "dd MMM") & " TO " & Format(DateAdd(DateInterval.Day, -1, dtmEnd), "dd MMM")Else strEvent = strEvent & Format(dtmStart,"dd MMM")End If lnkAlsoEvent.Text = strEvent lnkAlsoEvent.NavigateUrl = e.Item.DataItem("restURL") & "/events.aspx#e" & e.Item.DataItem("eventID")ElseIf e.Item.ItemType = ListItemType.Header Then imgBorder.ImageUrl = strImageURLDim imgBorder As Image = e.Item.FindControl("imgBorder")End If End Sub
I am using a repater whose item template is having a dropdownlist. Now i want to access that dropdownlist from a button click event. Here is the code iam using :
I need you assistance, Dynamic Delete LinkButton with CommandName=Delete gives me an error: Delete can only be called on a valid data item. nfact I am designing a Complex Grid using .Net 3.5 ListView Control with Scrollbar and Fixed Toolbar: This grid consist of 3 Tables:
1- footer 2- Toolbar Control 3- Scrolling Data Grid with Header
ListView give us only one ItemPlaceHolder to Bind Data as per LayoutTemplate, so I cannot able to manupulate my Toolbar Controls with ItemTemplate :(, therefore I decide to use ItemDataBound to add ImageButtons Dynamically using Init Page Event and I am able to get the result as you saw above:
ImageButton with funnel icon is with CommandName="Filter" ImageButton with magnifier icon is with CommandName="View" ImageButton with stop icon is with CommandName="Delete"
Now I can able to handle Filter and View with OnItemCommand Event but when I click Delete button I am getting an error as shown below: The grid used CSS I am sending you the HTML and code behind to resolved this problem: HTML CODE:
I am using aspnet menu control and i want to hide the item initially on page load and show the item after an event is trigger say button lick event Can any one give me an example?
I added a Gridview to my page and added a new item a delete button, now when i push that button there is an error... Do I need to add some code for it? And yes, can you give an example?
I've got a repeater bound to a datasource through the code behind. Everything is working fine so far except for this, I'm trying to concactenate a bound field as the id on a query string to an image handler:
I am learning how to use repeater. I added two links to my repeater, a delete and an edit link. However, when I click either delete or edit link, they both take me to same method. How do I add the link such that when I click on edit, it take me to an edit method and delete takes me to a delete method. Below is a sample code.
Also, how do I delete a single row in a repeated. For example, I have a simple form that display an item description and a quantity. There are six item display on the form, but I wish to delete the third item. How can I pass in an id that will delete the third item rather than delete everything (i.e where item_id = 3)
