Deleting From A Cascaded DataGridView Populated Via Linq To SQL?
Nov 18, 2009
I am having problems deleting any rows from a cascaded DGV. I get a run time error complaining that I am breaking a constraint almost as if LINQ is try to delete from the parent table. I have 2 DGVs on a form one displaying Species and the other all SubSpecies for the currently selected species and that works fine.
However when I try to delete a SubSpecies I get the following exception:- An attempt was made to remove a relationship between a Species and a SubSpecies. However, one of the relationship's foreign keys (SubSpecies.SpeciesID) cannot be set to null. At first I thought the error was raised by SQL server due to the Cascading Delete limitations on L2S but the error message for that is very different the DataContext.Log doesn't show any attempt to change the data.
The code used to bind the DGV's is as follows:-
Protected Sub BindControls()
Try
DC = New DataClassesWhatToPlantDataContext
I'm using a DataGridView to post the results of LINQ-from-SQL query. I was hoping that the data would be editable in the DataGridView, but it isn't. I made sure that DataGridView.readonly = false. I'm using VB.
VB 2008 DB = New CXToolDataContext() Dim Systems = (From TBLSYSTEMS In DB.tblSystems, TBLSYSTYPES In DB.tblSystemTypes _ Where TBLSYSTEMS.ProjectName = projectnumber And TBLSYSTEMS.SystemType =
The code below displays a thumbnail of each image in a specific server directory and when I click on the image it pops up a nice full sized picture. It works perfectly.
I would however, like to be able to delete an image. I first thought I could have a button at the bottom of the page with a checkbox next to each image, giving it a uniqueID as per the filename but as they are dynamically created I couldn't figure how to handle the Click Event on the button for a randomly named Checkbox ID. Then I tried adding a button next to each item and then tried an OnClick & OnServerClick to call a Sub but this didn't work either.
Private Sub ImageList() If Directory.Exists(Server.MapPath("JobImages" & DBC_JOB_JobID.Text)) Then Dim MySB As New StringBuilder
VB.net VS2008 My program dynamically populates a class as I click on specific calendar dates runtime. I am currently using various LINQ statements targeting this class for reporting purposes. However, all of my LINQ statements are hard-coded. Are there available solutions / modules which will provide me with a LINQ command and RESULTS window which can be set to an instance of a class so I can experiment with other commands runtime? Can LinqPad be used runtime against populated classes?
I tried binding a DataGridView to a DataSet using the DataSource property but no data appeared in the DataGridView. I placed a DataGridView in an empty form, making no property changes except for the name. I did not create columns in the DataGridView. In the form's load event I placed the following code for loading a dataset named ds Executing in debug mode, I confirmed that there was data in that dataset. No column headings or data appeared in the DataGridView. What am I doing wrongly? There are 34 fields (columns) in the DataSet - maybe it exceeds the capacity of a DataGridView.
How do I add rows that have already been populated. I saw a param that took an array. I have 8 columns, so would I need 8 elements in my array when I add them I have the code: me.datagridview1.rows.add() But I want to modify the data in the row using code, how would I go about doing this?
I am writing a program in VB.Net to manage text messages sent through an API. It allows you to view messages in a datagridview and filter by date, sent/unsent etc...
To load the messages I'm executing an SQL statement and retrieving a DataTable which then gets set as the DataSource for my DataGridView control.
The problem is that depending on the filters selected the user could be selecting a lot of records and it would take some time for the DataSource to update. I want to inform the user of this load time by providing a progress bar or label of some kind.
I have used progress bars before when looping through data but this is loading it all at once. I thought of displaying a label when the user clicks to load the data and then hiding it when the data is loaded. But this happens instantaneously even when the data is still loading.
Is there an event on the DataGridView I can use perhaps?
How do i delete a row from datagridview and datasource that is populated by a class file?dding of item goes like this, but not not sure how to delete the item.
Dim dt As DvdEzyDataSet.DVDCopyDataTable = DvdCopyDB.getDvdCopyByID(CInt(txtCopyID.Text)) Dim dr As DvdEzyDataSet.DVDCopyRow = dt.Rows(0) Dim dt1 As DvdEzyDataSet.DVDDataTable = DvdDB.getDvdByID(CInt(dr.FK_dvdID))
Wanting to have multiple datagridviews showing unique information (via filters?) based on cell content all coming from one data table.
Example: 3 datagridviews accessing the same datatable that has a [Job Status] column limited to one of the following 3 entries NEW, JOBS IN PROGRESS or COMPLETED and having that column hidden from view on all gridviews
Any resolution to make the cascading dropdowns work as expected when used inside edit mode of AspxGridview. I am using DevExpress Controls.
My requirement is as follow: If I select country="United States" then populate the "State" combobox and on selection of "State" populate the "City" combobox. If I select "country" other then "United States" then populate only "City" combobox with cities of selected "country" and no need to populate the "State" combobox. Also I need to hide the "State" combobox. i.e. like
Country State City ROW1 united states Alaska Douglas ROW2 Canada Toronto ROW3 Australia Sydeny ROW4 united states California Yuba City
I have a datagridview control that displays a list of expenses. I would like to code a button that will delete the record from the DGV and the DB table. Then I would like it to update so the DGV still shows up the updated DGV
I have a form with a DataGridView binding to an Access database. Everything works fine and it populates perfectly. Except when I delete a record. I get the following. I found a few threads about the issue but I cannot resolve the issue. Can some one give me a step by step to resolve this. [Code]
i am working on datagridview vb.net 2005 i am trying to modify the data with datagridview control the problem is the data is virtually modified in datagridview but no Change happened in my sql server 2005 database
I have a DataGridView in my Form. I am adding a handler as follows:
Private Sub DataGridView1_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGridView1.SelectionChanged If Me.DataGridView1.SelectedRows.Count > 0 Then
I have a datagrid and am using excel to store te data in. how can i delete ive tried a few things but nothing seems to work.including just the top line of code with dispatch = @Dispatch, and so on with all my column names
I have a DataGridView on a form that is being populated from a SQL table dataset by giving criteria from a previous form. I have 6 columns in the dataset, of which the last column should be combo box column containing items "Done" and "Pending". How do I make this bound column to a combo box column and display the value as well as the alternate item too in the combo box?
This is such a basic question, I'm almost embarassed to ask it. How do I loop through seleted rows in a DataGridView and remove the rows?I've tried this, but it doesn't work. After one row is removed, the index is all screwed up.
I have a List of an object, set to DataSource of a BindingSource, set to DataSource of a DataGridView. Then I added a DataGridViewButtonColumn which I want a click to remove that record from the collection. So I simply call collection. RemoveAt (e.rowIndex) from the DataGridView CellClick event. However this produces an IndexOutOfRange Exception; "1 does not have a value"..
So is happening here? I have maybe a vague idea, but would like to understand exactly which events are failing etc.. and what do i need to do to perform this action properly?
EDIT: This seems not to happen if I use a BindingList.. But when using a List, I get this problem..
Private Sub PasswordDataGridView_UserDeletingRow(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewRowCancelEventArgs) Handles PasswordDataGridView.UserDeletingRow
I want to let others to delete selected row in the following datagrid view and I have written it like this. Now when I select a row and press the delete button I can remove the selected row but it will not update the database which meant it will not deleting the above row.
I have bound my datagrid view using databinding. Private Sub dgvAllInvoices_UserDeletingRow(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewRowCancelEventArgs) Handles dgvAllInvoices.UserDeletingRow If MessageBox.Show("Do you really want to Delete this Invoice ?", "SD Technology", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) = DialogResult.Yes Then [Code] .....
How would I delete only the successful inserted rows for insert and then move the non successful rows up and allow the user to correct the data and get it ready for an insert. If I dont delete the successful rows then I will have multiple inserts of the same dataRow and we dont want that! And if I don't move the data up then it will have blank rows uptop and will end the try and not insert the corrected data. You can better see what logic I am trying to perform at the bottom of my code, right after I insert into the database.
Here is my code. Private Sub btnLaserGenerateTicket_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLaserGenerateTicket.Click 'Function declarations 'Object declarations Dim localOutputServer As SQLServer = Nothing 'Variable declarations (Form) [Code] .....
I have MS ACCESS database and a table name as ALARM.table fields areDate- property ate/timeTime- property date/timeMessage - property textnow I am updating the datagridview in alarm conditions,and when I press delete button I want that the selected row must be deleted., my code is
Dim conn As OleDb.OleDbConnection Dim strSQL As String Dim strConn As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:gcodeuser.accdb;
With a DataGridView bound to a bindingsource, which is filled by da.fill(ds) . How do I go about deleting selected rows when the UserDeletingRow event is fired? I've used the following code in the event:
Dim dsEmplTran As New DataSet daEmplTran.Fill(dsEmplTran) dsEmplTran.Tables(0).Rows(dgvEmplTran.SelectedRows(0).Index).Delete() Dim cb As New SqlCommandBuilder(daEmplTran)
