I have several controlson my form (Combobox, Textbox etc.). When one (or more) of them is changed i want to know it so when the form is closed i can ask the user if he wants to save the data. Is there an "elegant" way to do so besides creating an "on changed" event for each of the controls?
View 8 RepliesI have a form with several databound controls. Certain users will be able to change the data in these fields. Is there a way to check whether the data in any databound control has changed? I would like to do this so that I can enable an UPDATE button and flag a warning to the user that they must save their changes.
View 9 RepliesIs there a way I can add an event for when a value is changed, because, I need to add an OnDisconnected() event that detects when the mobjlistener.Connected value has changed...would I have to do a timer, is there a way I can do an event for getting disonnected?
mobjClient = New TcpClient("IP", 5000)
I would rather not add a timer, I would rather have an event that fires when mobjlistener.Connected changes, but if I can't I will go ahead and use the timer instead.The problem I have that I need to detect when this changes is because sometimes I get disconnected for an unknown reason using the TCP Multi-User Chat, it has handlers for disconnected, but whatever is causing the disconnect, it is just not detecting it, so if I could make it so that it will trigger when this is changed, then I can stop the problem I have once and for all.
I'm working on a Windows Service that watches a few folders for changes, creations, and deletions. It all works well with the exception of one watcher that watches a single file (XML File with Configuration Settings) for minor changes.
I tried taking the Windows Service code and putting it into a simple windows application with start/stop buttons for the filesystem watchers and stepped through it. It never detects the file change of the XML config file. The changes are indeed occurring and the "Date Modified" of the file is updating.
XmlEventReferences = New System.IO.FileSystemWatcher()
XmlEventReferences.Path = "C:XmlReferences"
XmlEventReferences.Filter = "*.xml"
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If a window, for e.g. Firefox, changes its title, from Firefox to Stack Overflow - Firefox then I want my app to record that Firefox changed its title.Is this possible without the use of a hook and loop (EnumWindows)? If can be only done with a hook, which type of hook?
View 3 RepliesI've been searching all over and I'm either not searching for the right words or it just doesn't exist. I've got a datagridview (dgv) on a form with some textboxes that are databound to different fields in the dgv's datasource. I want to capture an event if someone changes a value through one of the databound controls so I can mark the row as modified. I've been going through the dgv events trying to capture something, but I can't find anything that fires when a value is changed. The dgv is read only, so the values can only be changed through the databount textboxes.
How to I know if someone changes a value in the dgv? Is there a setting in the dgv that will tell me if a row is modified?
I have a DataGridView that uses a BindingSource to display my underlying DataTable. When the user makes a change to a row in the DataGridView the BindingSource's DataBindingComplete event fires. I'd like to get the DataTable's DataRow that caused this event. How do I do this?
The code below does not return the correct DataRow. For example, when I Fill my DataTable then change row 200 the Current property still equals 0, which always returns the first row in my DataTable.
Private Sub dgvCurrent_DataBindingComplete(ByVal sender As Object, ByVal e As DataGridViewBindingCompleteEventArgs) Handles dgvCurrent.DataBindingComplete
If e.ListChangedType = System.ComponentModel.ListChangedType.ItemChanged
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i have 4-5 forms and contains grid and some coding is done on selectionchanged event of grid. eveything is working fine but one of the form has this problem.as soon as i call the form form1.show and it fires the selectionchanged of grid before even it fire form load event. i'm not sure why? i try to debugged it step by step, as soon as form.show command is done the control goes to selectionchage event of grid and at the same time it is working fine on rest of the forms.
View 1 RepliesI have an number of text boxes and comboboxes on different forms. I have textchanged events which trigger a msgbox if the user enters invalid data(i.e. the number they enter is to big or to small). Is their a simple way to make the program not call the textchanged event when the form is loaded and the boxes get their initial value? Second is their a way to make the textchanged only be triggered when the user enters data not when the program clears the boxes?
View 3 Repliesi have my form set to 50% of the working area of the Form's screen. I need to know when the screen's workingarea change and resize my form accordingly. Example: the user drags his windows taskbar and hence the workingarea reduces, and as such i wish to resize my form to 50% of the workingarea
View 3 RepliesI have a Data grid with DatagridComboBoxColumn , and i want to Fire Event SelectionChanged when user Select any thing From the ComboBox , Do Some operations
View 1 Replieshow to trigger a textchanged event. I want to enter data in one text box and have the rest of the data show up after i fill it in. For example I enter someones name and then 3 other text boxes fill in with his height weight and ect after i entered his name.
View 3 RepliesHow can I make an event that is raised when a variable or property is changed (or can I just put the code I would put in an event in the Set section of a property?
View 5 RepliesI am having a problem catching the event that happens when a user selects a value from a combobox. What I was using was ValueMemberChanged, but because I am populating the combobox in code during runtime using SQL and a dataadapter and dataset, this also executes the ValueMemberChanged event, so that makes it difficult for me to know when the user actually changed the value.
View 3 RepliesI wanted to know if anyone could tell me how to access the Click_event.I have a boarderles form with a panel control which has the Dock property set to fill and on the panel I have placed a Label also with the Dock property set to fill. I also have a timer running.How can I get code to execute in the Label1 click event.I've tried doing it by using the generic Click_event and also with two variations of the Click_event Handles parameters
'Alternativ 1:
Private Sub Form1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click
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due to problems with OpenFileDialog and ClipBoard I have inserted a main subroutine in my WinForms app like this:
[Code]...
If I have the following ListView, how can I attach a SelectedIndexChanged event listener to the DropDownList so I can perform a command on the respective object? Imagine I have a list of new users and I want to add them to a usergroup by selecting the group from the DropDownList.
<asp:ListView ID="NewUsers" runat="server" DataSourceID="NewUsersSDS" DataKeyNames="ID">
<LayoutTemplate>
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In my project, I am trying to make a button_click event occur when the text of one of my labels is changed.I am using the following code,
Code:
Private Sub Total_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Total.TextChanged
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Here is my code for programming a program that reads from a file called RESORT.TXT
Containing the text:
Barb Allen
604 777 1234
[code].....
Does anyone know how to make an event that will fire when the value from a label is changed? (In VB.NET)
View 3 RepliesI 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.
vb.net
Private Sub DataGridView1_CellValueChanged _
(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _
Handles DataGridView1.CellValueChanged
[code]....
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.
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I'm using a textbox to supply a filter for the datasouce which is bound to a listbox. It works (mostly) with a few exceptions, one being i was to restrict the height of the listbox to the number of entries (upto a maximum number), so a bit like a combobox (which in effect is what I'm writing). One of the problems is when the number of entries changes there does not seem to be an event raised, although the OnDrawItem is called for the items to be displayed (the displayed ones!) Is there anyway to find out (in a derived listbox) when the number of entries has changed in the datasource?
View 4 RepliesI'm in an upper level industrial engineering class in which we're learning some entry level VB programming. We're working on building a program to solve the travelling salesmen problem (finding the shortest path through a collection of cities while visiting each only once) and I'm trying to add some 'fancy' to it so I can learn some more skills. The basic program is designed to load a bitmap file of a map into a picture box and a text file with the xy coordinates of any city positions. From there, the user can plot the cities with red squares, draw a random tour through the cities, or tour the cities by always visiting the nearest neighbor not yet visited. The modification I'm working on is a method of pointing out a specific city with a black square by entering the city's number (determined from the coordinate file) into a text box.
Private Sub TxtFindCity_textchanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TxtFindCity.TextChanged
Dim ObjFindCity As Graphics = picShowMap.CreateGraphics
Dim City As Integer
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So far, the program works, but I want the black squares (but none of the other graphics) that are created to go away once the text box is cleared. As of now they just hang around on the screen until I refresh the entire image with a 'clear map' sub. Any suggestions on how to accomplish this?
I want to populate the dropdownlist ddVerantwortlich1 with the people with the proper credentials based on the selected process step ddProzesss chritt1.It doesn't work if I want to change it using datasource and databindi have to manually loop through the table in the dataset returned from the query. then it works. but not otherwise.[code]
View 1 RepliesI have a usercontrol in my application and inside of this usercontrol I have a declaration:
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How can I do some code when the user changes what line the caret is on? So something like:
sub textbox1_lineindexchanged (byval ....) Handles Textbox1.Lineindexchanged
'do code based on the current line
end sub
I am using a richtextbox, just I always used it so I just call it a textbox.
Below I create an array of labels. I would like to add an click event to my labels. Can someone point me in a direction?
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I am currently using DevExpress 11.2 within Visual Studio 2010. Currently I am using two DevExpress.XtraBars.BarEditItem which gives me two check boxes (with a label) in my menu bar (DevExpress.XtraBars.Bar) at the top of my windows form. Right now I have working code so that when one checkbox is clicked it unchecks/checks the other checkbox and executes code specific to that box. This works.
My problem is that the DevExpress.XtraBars.BarEditItem does not have a check changed event. Currently I am using the EditValueChanged event as the checked check box is set to True and the unchecked checkbox is set to false. However the EditValueChanged event isn't called until the checkbox looses focus. This doesn't work for me as I want it instantaneous. I looked into the itemClick and ItemPress events but they don't give me the new editvalue and if someone presses on the caption (rather than the box portion) it still fires. Is there someway to get the event right away??
I am looking in two different older projects (both in Visual Studio 2008 and using DevExpress 9.2 and 10.2) and it looks like it does everything the same way as me yet the EditValueChanged event fires right away without any lose of focus.