.net - BindingSource.ListChanged Event Won't Fire When Data Is Changed?
Jun 12, 2012
I am trying to get my grid to refresh automatically when the underlying data is updated in the database. Isn't this supposed to work? Or am I missing something? I created a DataTable within my DataSet. Then I created a new form and added a DataGridView (actually I'm using DevExpress' XtraGrid but am trying to get it to work with just the Microsoft controls). I use the menu in the upper left of the grid to set the grid datasource to the datatable in the project data source. This then automatically adds the dataset, BindingSource, and TableAdapter to the form.
I have the following form1, when called as the startup, everything works fine. Usually after I added a new row, fill in the fields in that row and close the form without leaving that row, both bindingsource listChanged event will fire.
However, when called from the another form. It does not work. bindingsource listChanged event does not fire when I close the form after adding a new record. Likewise dataGridView1_RowValidated event as well.
I datagridview and I populate it using a bindingsource. I have the following code in the bindingsources PositionChanged event and it works as I want it to except when I filter the bindingsource.
Private Sub ProductBindingSource_PositionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ProductBindingSource.PositionChanged If (Me.ProductBindingSource.Current IsNot Nothing) Then Dim dr As DataRow = CType(Me.ProductBindingSource.Current, DataRowView).Row Dim ProductId As Long = CLng(dr.Item(2).ToString) Dim ResultId As Integer = CInt(dr.Item(0).ToString) GetReport2(ProductId, ResultId) End If End Sub
The scenario is when I click on a row in my datagridview the bindingsources positionchanged event fires and I load a crystal report. Problem is when I filter the bindingsource, even though the first item in the grid is now different the incorrect report is displayed because the bindingsources position hasn't changed.
I am using the following code to populate data in Textbox1:
[Code]...
I have few functions assigned in TextBox1_TextChanged event. The problem i am facing is this event is fired twice, once after the Fill command and another after the Position command whereas i want the event to fire only once after the Position command. What should i do?
I have added a handler in my code for the bindingsource currentchanged event: I have populated a datagridview. AddHandler PeopleBindingSource.CurrentChanged, AddressOf ChangeHandler then on the ChangeHandler Sub I populate an HTML report. However I don't think this is the best event to handle this. I have to datepickers on my forma as well. So say I click on a row in my dgv, that persons report loads. Then I change the start date on my datepicker,
Now i want to click on that row again to refresh the data, but since the currentchanged event doesn't fire the data won't refresh. I have to click on another row then click on the row I want to view in order for the event to fire. which event is best to do this?
Lets say I have 2 panels, lets call them P1 and P2... P2 is inside of P1...If I have a P2.VisibleChanged event handler it doesn't get fired when the panel becomes invisible P1 becomes invisible ... even though the .visible property changes???
i have problem for the drop down list in the grid view, it not fire the select index changed. I bind the data for the drop down list when the row databound. But when i select the data, it not fire the select index changed. Another drop down list which hard code the item list fired the select index changed. Below is the code behind and the front end code.
How can I cause the Paint event to fire from a Form_Click() event? This is what I'm trying to do...
Public Class StrTests01 Private Sub StrTests01_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Click Dim ps As Graphics = Me.CreateGraphics()
on my Form I have a DataViewGrid and some textboxes with a save button (they are filled with additional data of the selected row).Save is disabled first, when I change something in the textboxes the save button is enabled.When the user changes a gow in the grid, I want to ask before changing the grid row, if he wants to save (if the button is enabled).I am using RowEnter but this is too late, then the selected row already changed (and my textboxes already got new data)...What event can I use to ask if I should save stuff before the user changes a row?Something like BeforeRowChanging with a chance to cancel changing the row?
I have a windows service in VB.NET 2008 and want to fire an event every hour on the hour within the service?
I have this working in an application were i assign the current hour to a variable and check each minute if the variable has changed. Is there a cleaner way of achieving this in a service?
I also want the service to read this in form an XML file i have modified from a service control app can i use app.config for this as i've read your not supposed to write to this file?
I have this function that totals a series of textboxes everything works fine except the last line, i need to call the function a second time for the correct total of last line,anyone have any ideas what i am doing wrong? I even tried to make the last line its own function and call it seperately but have the same behavior.
I am trying to drag and drop items from a listbox into a richtextbox? I can not get the .DragDrop event to fire? I have copied and past the code from [URL]
I can get the .DragEnter event to fire. The mousedown event fires the drag and drop, is there something for mouseup?
I can't seem to get the Form.GotFocus event to fire.I have two forms - a main window and a debug window.The debug window will always be shown with the main window. But, I don't want the debug window to appear in the task bar - it's unnecessary.While my program is running, when I select another program, my main window and the debug window are placed behind the program that I selected. From the task bar, I can bring my program back to the front by clicking on it in the task bar. The problem is, that now my debug window is behind the other program.I have code that will "DebugWindow.BringToFront", and it works. But I need some way to run do this when the main form gets the focus.I do not wish to make any of my forms Modal. At least not permanently. If the solution is to change the modal property of the form temporarily, then that wouldn't be a problem.
I tried Me.Enter, Me.Activated, Me.Click and a few other events. Me.Click only works when I click within the Form window, not the form's title bar. Me.Activated caused problems - The code ran, but it would always end with the focus on the Debug window. When I tried to click on the main form, the Activated event would fire again, sending the focus back to the debug window.[code]
I have a MDIcontainer form witch handles MDIchildren. The problem I'm having is when i open a new Mdi child and close the Main form , The app is supposed to ask if i want to save the current MdiChild. Heres my code
I have this function that totals a series of textboxes everything works fine except the last line, i need to call the function a second time for the correct total of last line,anyone have any ideas what i am doing wrong? I even tried to make the last line its own function and call it separately but have the same behavior. [Code]
I have a Textbox on my application that recieves data from another application via a sendmessage call from the other app.
I can see the data being entered in the textbox but the TextChanged event never fires when the text changes. I need to process the data that is sent but since the event does not fire I'm kinda stuck..
I am trying to implement an update panel on my web page. when I add this, everything works fine:
<script runat="server"> Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Me.Label2.Text = Date.Now.ToString
[code]....
This will cause the event to not occur. If i change the "<" from the string, all is well. why cant I have "<" in my strings? This is important because i wont allow me to put an xml string in the text box.
I am using a column with check box to be able to select my data row from a GridView. But The OnCheckChanged event won't fire. I have tried reading articles to make it work and copy code exactly and it just won't fire. I am using vb.net and asp.net
in my application, I pull in http code from the server side. When this code is placed into the application - the event will happen when clicked in IE, but not in any other browser. Heres the part of the code that deals with the image that is clicked and the event.
LoadChild is a javascript function on the client side of the page. When the image is clicked in anything other than IE , nothing happens. Can anyone see why this is happening? It may be a formatting issue.
