Forms Data Controls :: Delete Row From ListView With No DataSource?
Apr 28, 2010
First time using a ListView control, I have it inside an UpdatePanel:
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When the UpdatePanel Loads, it feeds the data to the ListView. Whenever the user clicks on a row in the ListView, a new window displaying a "note" pops up, the ItemDataBound event ties it all together. What I'm trying to do is add a button to each row so that the user can delete the row. This would call a Sql statement and then the row should disappear. I followed a couple of articles I found on ListView on how to do this, so I added a button called imgBtnDeleteNote (see markup above) and set the CommandName = "Delete", hoping that it would trigger the ItemCommand and ItemDeleting event (I have some bogus code in them, first I wanted to see if they would trigger).
The problem is that they don't seem to get triggered when I click on the delete button. All the rows in the listview disappear, and when I manually refresh the page they come back. My guess is that the events are not firing because I'm not using a DataSource object in the aspx code, but I'm not sure.
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Sep 14, 2010
I created a ListView and attempted to delete a record using the delete button and native procedures. It failed and threw an error.Pass in a valid dictionary for delete or change your mode to OverwriteChangesIn researching this issue, it appeared there is a problem with the list view when deleteing and
ConflictDetection is set to
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Feb 22, 2010
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:
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CODE BEHIND VB.NET
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Feb 18, 2011
I keep getting Object Reference not set to an instance of an object errors when I try to use the ListView delete function. It is a fairly freshly created listview and is very close to the original template so not sure what is going wrong. Some possibly relevant code:
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I also put in a breakpoint in the deleting event (only reason I added the deleting event) to look at the status of everything. When I do: Contact delContact = (Contact)e.Entity; and look at the values, the values for almost everything are set to null. It does have the correct value for the ID of the contact object that needs to be deleted. When I continue to step, it jumps to my designer.cs file and appears to break here:
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likely because _Case_ID is null. The exact exception I'm encountering is: System.NullReferenceException: Object reference not set to an instance of an object. While I could probably re populate the object with correct values, that doesn't seem likely to address the real cause of the problem.
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Aug 30, 2010
I'm new to Asp.net, and I looked at an example of using a listbox's selected index to delete from a sortedlist. I'd like to write somethingthat would get the selected index from a different control, like a listview, and then delete from the sortedlist. I've read up on a few examples on how to bind data from a sortedlist to a listview, but I've not seen an example of how to get the index once the data is displayed! Can this be done?
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Jul 21, 2010
I need a Listview that will show info from several database tables. My delete button, will not delete the record from the database. I cannot get DeleteOnSubmit() to work at all. I am in the very beginner stage. This is my first project. I thought this would be a good project for learning purposes.
Here is my code:
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Aug 9, 2010
I have a Listview which uses a StoredProcedure to display the data. That part works fine. What I'm trying to do is delete multiple lines using a different store procedure. So I did this code:
<asp:SqlDataSource ID="SqlDS_BasketDetails" runat="server"
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Feb 16, 2010
Within my ItemTemplate on a listview i have a link button carrying out a delete command. As it's a custom command i use the ItemCommand to do the deleting and have a stub itemdeleting.
It works fine set out like this however i only want the delete button to be available to logged in users. If i wrap the linkbutton in a loginview and then click on it the ItemCommand and ItemDeleting never get called the page just refreshes.
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Oct 3, 2010
It should be simple, but I didn't found yet how to do it. There is only one user (Admin with user name and passowrd, he has a cookie so I know when he is watching the page) I would like to show him the Update/Delete/Insert button options in my ListView, but to the other users I don't want them to be able doing this kind of things, So it should be hidden from them. How I am doing it in C# code? Showing/Hiding these buttons?
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Feb 11, 2011
I've a listview in which i'm binding data from objectdata source. I have a requirement where i've to allow edit/delete for only certail listviewitem which meets specific requirement. How do i dynamically set that some item can be only be edited not deleted thus only edit button/link should appear and vice-versa.
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Apr 27, 2010
I have a collection of objects I bind to a Listview like this:
if (!IsPostBack)
{
List<Equipment> persons = new List<Equipment>
{new Equipment{ItemName = "Sworn", ItemCount = 7, ItemCost = 255}, [code]....
I want to Add/update/delete from this object collection and submit the final data object collection to the BL when the user saves... Rather than just delete/add/update everytime a row is changed.So my question is how do I maintain state for that datasource? I have tried this (delete example)
protected void lvMain_ItemCommand(object sender, ListViewCommandEventArgs e)
{
switch (e.CommandName)
{
case "Delete":
{[code]....
But it does nothing. I can't rebind it to the datasrouce because at this point the datasource is null.. I assume the listview keeps its own view state which contains the data?... I guess worse case I can always hold the Object Collection in a Session object.. ..
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Mar 22, 2010
I am trying to populate the ListView using LinqDataSource data source but the issue I am having is.I need to load the listview on Search button click action.
IN the page_load I kept like this:
===========================================
LinqDS.Selecting += new EventHandler<LinqDataSourceSelectEventArgs>(LinqDS_Selecting);
protected void LinqDS_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
e.Result = ObjectDS;
}
=============================================
This works fine but this happens on page load,i want this binding to happen on button click?is there a way to do this?
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May 7, 2015
Here i want Do project with Angular js..
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Jul 25, 2013
How to delete the row if checkbox is checked using listview of asp.net with c# ....
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Jul 24, 2012
I have a ListView in my system..
And inside it, there is a button called "Delete".
In the behind code, I tried to access the button control in the listview. However, the code keep looping non-stop..
The logic is the Delete button will only be visible by the current logged-in user. And I had already set the button as visible = false. I had set breakpoint to the line : Delete.Visible = true;. Once the execution reach here, it loop back to the first line again..
And Delete button remain invisble despite the execute visible = true statement..
Here is the code:
protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
MembershipUser currentUser = Membership.GetUser();
Guid currentUserId = (Guid)currentUser.ProviderUserKey;
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Feb 3, 2011
I want to compose data myself without using any DataSources. I want to display it in ListView. How to implement the DataPager to function properly? I tried implementing PagePropertiesChanged of ListView, but it doesn't work.
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Jan 15, 2010
I have an array that I need to display using a feature like listview. Is that possible? I need to be able to display a "temporary" list of information that the user may add or delete entries. Once they approve the list I will loop through the list and store the information in a table.
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Jan 21, 2010
I'm using the asp.net membership on my website. On the User Administration page i've got a GridView to show the details of the users on the site. As a datasource rather than just using the Membership.GetAllUsers function i've got a SQLDataSource as i need to display user information from 3 different tables. I'm trying to add a delete button to the GridView. I'm setting the Membership's UserName as a DataKey and then using the RowDeleting event to call Membership.DeleteUser for the appropriate UserName. This works fine and the user is deleted however i then get an error showing up that "Deleting is not supported by data source 'SqlDataSource1' unless DeleteCommand is specified."
I don't want to use the SqlDataSource for deleting as i've already done it using the Membership. How can i stop it from trying to do this? Here is the cut-down that i have if you're interested. The selectcommand in the sqldatasource was auto-generated by it.
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Dec 7, 2010
I have a gridview that pulls data from two tables, CLIENT and PAYMENT. I want to add the edit, delete functions to the gridview for the payment portion of the table, that is to edit or delete the payments but not the client. I've manually enabled the edit, delete functions and input the queries. I've also deleted the textboxes from the templates which draw from the CLIENT table so they cannot be edited. Everything looks good on the surface until I actually go to edit or delete anything, and it has no effect.Here's the structure of the two tables:
CLIENT PAYMENT
ClientID Pk PaymentNumber Pk
FName CLIENT$ClientID Fk
LName PaymentDate
ContactNo NULL PaymentAmount
ArrivalDate PaymentDetails NULL
DepartureDate NULL
CurrentResident
Here's the update query:
UPDATE [PAYMENT] SET [PaymentDate] = @PaymentDate, [PaymentAmount] = @PaymentAmount, [PaymentDetails] = @PaymentDetails WHERE [PaymentNumber] = @original_PaymentNumber AND [CLIENT$ClientID] = @original_CLIENT$ClientID AND [PaymentDate] = @original_PaymentDate
AND [PaymentAmount] = @original_PaymentAmount AND (([PaymentDetails] = @original_PaymentDetails) OR ([PaymentDetails] IS NULL AND @original_PaymentDetails IS NULL))
Finally, here's the delete query:
DELETE FROM [PAYMENT] WHERE [PaymentNumber] = @original_PaymentNumber AND [CLIENT$ClientID] = @original_CLIENT$ClientID AND [PaymentDate] = @original_PaymentDate AND [PaymentAmount] = @original_PaymentAmount AND (([PaymentDetails] = @original_PaymentDetails)
OR ([PaymentDetails] IS NULL AND @original_PaymentDetails IS NULL))
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Dec 5, 2010
I am using a ListView and i want to get my datatables sorted by clicking table headers. I am binding my ListView to DataSet via DataSource peoperty of ListView.I donot want to use ObjectDataSource or SQLDataSource Controls.
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Nov 11, 2010
i would like to sort a listview. i don't have a datasourceID. i bind the datasource manually. i think of using jquery(tablesorter) but i don't know how to use it.
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Mar 9, 2011
I have a user control, named productslist.ascx. On pruductslist.ascx, I am using Entity Datasource and a QUERY EXTENDER and LISTview. I have a page Defualt.aspx. On Defualt.aspx, I have a TEXTBOX with a SUBMIT button for searching the site. Everthing works fine so far, AS LONG as the results of the Search is posted back to Default.aspx. What I want is for the results of the search to be posted on a different page.
So I created a new page, Results.aspx and set the postback url to it.
What I want is that when a user clicks the Submit button, after entering a search string, the text the entered is used to execute the query on Productslist.ascx and the results displayed on RESULTS.ASPX. Again, everything works fine as long as the results are posted on same page hosting the usercontrol, BUT I want the postback url to be a different page. I am coding in VB and VS 2010.
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Dec 11, 2010
I have a listview which has a complicated Item template that contains a repeater, an objectdatasource and some other controls. On the first run I am only showing 10 Items of the listview. The user has an option to show 10 more ListView Items. If user clicks on show older items; the listview shall add another 10 items. how to go around this since my list view already has a datasource and I don't want to rebind the whole listview all over again. Instead; I just want to add another 10 items.
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Aug 17, 2010
so instead of a datasource control, I have a Data Access class that I'm using to populate the ListviewI added a datapager and everything pretty much works until I hit the first or last button. Then, I get the following error: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/>Also, Something was mentioned about ClientScriptManager.RegisterForEventValidation - - couldnt' really find an implementationI tried setting:EnableEventValidation="false", but then, all I got was squirelly interaction with all the numbered links (sometimes having to double click them, etc) - no matter what I tried from there on out, even when I removed the enableEventValidation property altogether.
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Mar 5, 2010
I'm using VS2008. When a dataset is bound to the DataSource of a ListView, SelectedIndexChanged event does not fire. If I used DataSourceID instead, it has no problem. But SelectedIndexChanging event fires for both.
why and how I can get SelectedIndexChanged event fired when DataSource is used?
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