I have a Form with a TabControl on it. On one of the TabPages is a DataGridView with a New- and Delete-Button below it. I also have a Validating-Event for the DataGridView. Inside the Event I do some checking. If the conditions are not met I do a simple:
e.Cancel = True
Return
But after that my Delete-Button isn't working anymore. Even if I set a Breakpoint right at the start of the Click-Event nothing is happening what could that be? I have set the CausesValidation to false on the Button.
Update
I need to handle both Events, because the Sum of this DataGridView is compared to another value. The Sum can't be smaller or bigger than the other Value. But the User can enter what he wants as long as at the End the Sum is correct. I can't do that in the CellValidating because as soon as I change a Value the Sum doesn't match anymore
Update
I have observerd the following Scenarios where it doesn't work:
I change Data in the DataGridView and then trigger the Validating-Event. It starts working again when I input correct Data and switch Tabs
I create a new Row, trigger the CellValidating-Event and after that the DGV Validating-Event
Related
I have a feeling this is a very simple thing that I'm overlooking.
I have two ComboBoxes that allow users to search for/select the record that they want to view. One is filled with Customer Names and the other is filled with Customer Numbers, so the user can look for a particular record by either selecting the Name or Number.
Each ComboBox is filled by a Data Table returned from a SQL Server database.
Each ComboBox has DropDownStyle set to DropDown, AutoCompleteMode set to SuggestAppend and AutoCompleteSource set to ListItems.
The user can either select by clicking the DropDown arrow and then clicking on the item they was or they can begin by typing and the ComboBox narrows the number of items in the list based on the characters the user is typing.
Using the mouse to click on the item in the list that they want works fine...it fires off a routine to retrieve the selected item from the database.
However, when the user types in the desired selection and presses ENTER, nothing happens. They must click the DropDown arrow and click on the item in order for the program to pull the appropriate record.
How do I get the ComboBox to pull the appropriate record when the user hits enter?
I'm using Visual Basic.
From the sounds of it, you need three events.
You need to use a timer to know when the user has stopped typing. To do that, you need one event would be when that field they're typing in has it's value change (<control's name>.TextChanged). That would start/restart a timer ticking (so that the user has a couple seconds to pause before the next event fires).
The next event would be the Tick event for that timer. That event would stop the timer, and then give focus to the right field so that when the user hits ENTER, they're not hitting ENTER in the field they've been typing in. You'll need to write a function to look up the right item in the ComboBox and call that.
Then you'd have a third event, either KeyPress, KeyDown, or KeyUp on the ComboBox itself. I'd lean towards the KeyUp to avoid issues if the user holds ENTER for whatever reason. That'd be what selects the item.
As a final FYI, I'm assuming you're using Visual Studio to write your code. If not, you should, and if you are/once you are, you can select the field you want to work with in the drop-down at the top left of the editor and then look at the associated events in the top right drop-down.
Thank you to JMichael for getting me on the right track with this one. I'm posting my solution here just in case it helps someone who has a similar question in the future:
The code that I added to the ComboBox's SelectionChangeCommitted event needed also to be added to the ComboBox's KeyUp event:
Private Sub cboPolicySearch_KeyUp(sended as Object, e As KeyEventArgs) Handles cboPolicySearch.KeyUp
If e.KeyCode = Keys.Enter Then
GetSelectedPolicySearchRecord()
e.Handled = True
End If
End Sub 'cboPolicySearch_KeyUp
The GetSelectedPolicySearchRecord() sub contained all of the information I needed to call my SQL Stored Procedure to select the data for the record that the user selected in the ComboBox.
Previously, this was only being called from the ComboBox's "SelectionChangeCommitted" event which is executed when the user clicks the drop down and then clicks a policy number from the drop down list.
I needed to add the same call to the GetSelectedPolicySearchRecord in the ComboBox's "KeyUp" event for when the user presses enter.
I know I need to provide some code, but I'm not sure what I should show, so please suggest if you can.
I have a bound datagridview on a Windows form. After the form loads and the datagridview gains focus (on mouse click), the first row (and a specific column) loses it's data, changing the cell's state to dirty. It doesn't matter where I click to bring the dgv into focus, that row/column always goes blank. What event is firing that may trigger that loss of data?
Again, any suggestions as to what code to post would be great. I know that will help answer this question.
Edit #1
This code is an infinite loop, but I'm adding it in response to a comment:
Private Sub dgQCOrders_CellPainting(sender As Object, e As DataGridViewCellPaintingEventArgs) Handles dgQCOrders.CellPainting
If e.RowIndex = 0 And e.ColumnIndex = 9 Then
If e.FormattedValue <> e.Value Then
MsgBox("Changed")
Else
MsgBox("Unchanged")
End If
End If
End Sub
Edit #2:
Private Sub dgQCOrders_CellPainting(sender As Object, e As DataGridViewCellPaintingEventArgs) Handles dgQCOrders.CellPainting
If e.RowIndex = 0 And e.ColumnIndex = 9 Then
If e.FormattedValue <> e.Value Then
Me.txtTest.Text = "Changed"
Else
Me.txtTest.Text = "Unchanged"
End If
End If
End Sub
This test tells me that the new value is null, it is deleting that first record (which I already knew)--still don't know how to fix it!
Edit #3
More explanation:
Currently, the only event I'm handling is form_Load, which fills the dgv using the tableadapter for my (bound) dataset. I then bind the dgv to the binding source.
I know that this error only occurs when the dgv gains focus (I tested this by setting the focus to the dgv when the form loads). I have a series of checkboxes/listboxes/textboxes on this form as well that allows the user to filter the dgv dynamically (back-end, I filter the binding source). If I filter the dgv first, the same row and the same column (their indexes do not change) maintains it's value when I move the focus to the dgv. When I clear the filter, the same row and the same column, loses it's data again.
I did have the _CellStateChanged event firing after a user makes an edit. Currently, it is commented out so the data loss isn't reflected in my dataset.
Additionally, I have another dgv on a different form, bound the exact same way, with the _CellStateChanged event and everything fires and saves correctly. I have gone through the designer coding for both forms, I can't find any setting difference between the two.
I'm losing my mind over here! Any help is GREATLY appreciated!
I decided to recreate the form from scratch and this error is no longer occuring. I have compared the two sets of code and can't find one discrepancy between them. If anyone has this problem in the future, save time and recreate all of the objects related to your dgv.
Maybe I understand that statement within the focus cell is not saved in the database table if U save
this problem I solved
add blank textbox control to your form which contain dgv and named txtFocus
placed it behand dgv and use its properties send to back Or
Evoked by the bottom of the screen so do not show it
then
before save
white then :
txtFocus.Focus()
sendKeys.send("{F2}")
only in this case U can save the data inside last cell changed in dgv
best Reg
Ashraf
I have a program that is going to load data into a DataGridView, where users can edit/add/delete data. When they close out of the form, if there are any changes made, it will ask if the user wants to save the changes to the database.
So I have a DataTable that I load and assign to the DataSource of the DataGridView. I can then make changes to the data within the table, and if I call the DataSet.Update method, it updates.
However, if I call the DataTable.GetChanges method and look to see the changes, I get nothing, unless I have tabbed/clicked/whatever off of the current row of the DataGridView (in which case .GetChanges works) This leads me to believe that the changes are not committing to the DataTable unless the row loses focus.
So, is there a way to check to see if any cell is changed in a DataGridView, or a way to commit those changes without tabbing off of the row?
Again, this fails me if I don't change the row in the GridView, but works otherwise. I want it to work in both situations.
Dim changedRows As New DataTable()
changedRows = dtInfo.GetChanges(DataRowState.Modified Or DataRowState.Added Or DataRowState.Deleted)
If Not changedRows Is Nothing Then
....
End If
You can call the Form.ValidateChildren method, this will validate and commit all controls in the form, including your DataGridView. This method returns false if there is a validation error.
I have a DataGridView with a single column that currently displays a short list of items. When the user clicks a button to run an update, each row/cell is read and processing begins.
I would like to have the selection indicator move down the rows in the DataGridView as it completes processing of each record. How can I display the iteration of the DataGridView rows while the processing is underway? A redraw of the DataGridView or something.
This is a VB.net windows form, I know how to do this with AJAX I think, but how can I achieve this in a Windows form?
Thanks,
For each row As DataGridViewRow in myDataGridView.Rows
'Unselect previous row, then select current row
myDataGridView.ClearSelection()
row.Selected = True
myDataGridView.Refresh()
'Do processing here...
Next
This will select each row but won't scroll down if the current row is out of view. To scroll down automatically you can set the DataGridView FirstDisplayedScrollingRowIndex property.
I've got a vb project I am updating and it has a datagridview, a panel, and buttons along the bottom. The buttons control CRUD operations. The panel shows numerical up/downs and textboxes to represent the selected row.
I use some logic to keep track of current selected row and current row index for timer updates in the background. Upon delete I reset focus on the first row. Upon loading I set focus on first row. On update I keep current row focus.
Upon a good insert I would like to set the focus to the row I just inserted. But I do not know a way to determine what the rowindex value is for this freshly inserted row. My datatable which the datagridview uses is sorted on two id columns so it's not like the new entry will just jump to the bottom.
Any ideas on how I can implement this?
If you don't want to deal with the RowAdded event as Jay Riggs suggested, if you add it using a row object, as opposed to just Rows.Add, you should be able to pull that off of the row object after it's inserted.
Dim dgr As New DataGridViewRow()
DataGridView1.Rows.Add(dgr)
Me.DataGridView1.Rows.IndexOf(dgr)
This should also work for insert as well.
Check out the DataGridView RowAdded event; its DataGridViewRowsAddedEventArgs parameter includes the RowIndex property which gives you what you need.
The event fires everytime a row is added, so you'll have to either wire the event up when you want to check for added rows, or ignore the event when you don't care when a row is added (such as when your grid fills with data).
If you manually add rows to the DataGridView, then you can just use the return value from the Add method. Examples:
Dim newRowIndex As Integer = myDataGridView.Rows.Add()
myDataGridView.Rows(newRowIndex).Selected = True
No need to call IndexOf. If the DataGridView is bound to a DataSource then Jay Riggs' solution of using the RowsAdded event is the way to go.