Whatever project I'm making, I always encounter a problem with a Windows Forms Timer control, I guess I just make a little mistake somewhere... So I thought I'd post it here and hopefully someone here can explain what I'm doing wrong.
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I'm wondering what exactly is the difference System.Timers.Timer and System.Windows.Forms.Timer???
View 4 RepliesIn a vb 2010 project, I have 2 win forms: Form1 and Form2.
In the Form1 class there is a server-based timer: when the "elapsed event" fires, then I update the text of a Label1 on the Form2. A very simple code:
do wpf forms have a timer control?
View 1 RepliesHello,
I'm writing a windows service and initially tried just using a regular System.Windows.Forms.Timer, but never saw it's tick event get fired in my debugger. From doing some research, it appeared that I needed to use the S ystem.Timers.Timer control instead. In order to make debugging easy, I set my timer interval to a really short value 1000 ms. I'm seeing some rather strange behavior, though. It appears that my timer control is creating multiple threads within my application, or is this just a bug in my debugger? I have an event handler for the Elapsed event like so:
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When I step through my code like this, it now appears to work as expected. Has anyone else run into this?
I have a System.Windows.Forms.Timer named "DialogBoxTimer" set up on a form. When the form loads, it has a command to stop the timer. I have a routine [SPDataRecd(...)] that handles SerialPort1.DataReceived from a serial port (modem). When it is activated by a modem event, I want it to start the timer [DialogBoxTimer.Start()], but it doesn't work.If the timer is running, SPDataRecd can *stop* the timer [DialogBoxTimer.Stop()], but it can't start a stopped timer.
View 6 RepliesI have added a timer control to a VB.NET windows form to have a message flash on and off between ticks. When I load the form I have the timer disabled. When i click on a command button, I set Timer1.Enabled to True so that the timer can begin flashing the message. The timer does not flash the message. I added a MsgBox function after where I turn on the timer. When the message box is displayed and I click OK, then the timer starts flashing the message. I turn the timer off later and that seems to work fine. I have tried the Timer1.Start() method but that does not work. Any thoughts on why the message box allows it to run but the form does not?
View 8 RepliesImagine that I have a System.Windows.Forms.Timer with 1000 ms interval. If I call Timer.Start() method and after 500 ms I call again Timer.Start() what happens? The second Start call will reset the interval or not? Are there any side effects?
View 3 RepliesI have the code which checks if there is a selected tab
Private Function GetBrowser() As WebBrowser
If TabControl1.SelectedTab IsNot Nothing Then
For Each c As Control In TabControl1.SelectedTab.Controls
If TypeOf (c) Is WebBrowser Then
Return c
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Does calling the Dispose method on a Windows.Forms.Timer call it's Stop method? Or should I stop the timer before I dispose it?
View 5 RepliesI need an accurate timer to interface a Windows application to a piece of lab equipment.I used System.Timers.Timer() to create a timer that ticks every 10 msec, but this clock runs slow. For example 1000 ticks with an interval of 10 msec should take 10 wall-clock seconds, but it actually takes more like 20 wall-clock sec (on my PC). I am guessing this is because System.Timers.Timer() is an interval timer that is reset every time it elapses. Since it will always take some time between when the timer elapses and when it is reset (to another 10msec) the clock will run slow. This probably fine if the interval is large (seconds or minutes) but unacceptable for very short intervals.Is there a function on Windows that will trigger a procedure every time the system clock crosses a 10 msec (or whatever) boundary?
UPDATE: System.Timers.Timer() is extremely inaccurate for small intervals.I wrote a simple program that counted 10 seconds several ways:
Interval=1, Count=10000, Run time = 160 sec, msec per interval=16
Interval=10, Count=1000, Run time = 16 sec, msec per interval=15
Interval=100, Count=100, Run time = 11 sec, msec per interval=110
Interval=1000, Count=10, Run time = 10 sec, msec per interval=1000
It seems like System.Timers.Timer() cannot tick faster that about 15 msec, regardless of the interval setting.Note that none of these tests seemed to use any measurable CPU time, so the limit is not the CPU, just a .net limitation (bug?)For now I think I can live with an inaccurate timer that triggers a routine every 15 msec or so and the routine gets an accurate system time. Kinda strange, but...I also found a shareware product ZylTimer.NET that claims to be a much more accurate .net timer (resolution of 1-2 msec). This may be what I need. If there is one product there are likely others.
I have a timer in vb.net and it's interval is 1000ms ,. i have placed in it's timer_tick event a code that will print screen the screen and save it to a database.The problem is when i click outside of the form, or loosing the focus of the mouse to the form containing that timer/printscreen, the timer stops. As a result the printscreen also stops.here are it's properties:
generate member = true
interval = 1000
modifiers = friend
Where in VS2010 can I find a horizontal separator control, as can be found in Outlook settings (screenshots below)?[URL]..
View 3 Repliesis it possible to add images to listbox control of windows forms..
if I do it anyhow using items.add method one item at a time then how to add items valuemember to items ..
I need ability to display content in Hex View, like this from WinHex
Offset 0 1 2 3 4 5 6 7 8 9 A B C D E F
00000000 EF BB BF 0D 0A 4D 69 63 72 6F 73 6F 66 74 20 56 ..Microsoft V
00000010 69 73 75 61 6C 20 53 74 75 64 69 6F 20 53 6F 6C isual Studio Sol
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I have to design a custom "log grid" control to use in another of my projects.Up front, I am new to vb.net 2008. I have used VB6 for years and I am trying to learn how to resove the differences as I go. But I need help.
This log grid contains 96 columns and 4 rows.I tried using the TableLayoutPanel and a Panel per cell but found the control to slow to paint. That's 384 discreet controls.I am now trying a usercontrol with a panel and GDI+ to create the grid. I've created a collection for the columns and a collection for the rows. So far so good. My mouse clicks raise the correct events per cell.
I now need to indicate which column the mouse is over. This is the problem. The column must be highlighted by a vertical bar from the top of the column to the bottom. It must also be transparent. I need to see the gridlines under the highlight. I've tried using region using the following code. (myRegion is declared Private MyRegion as Region at module level for persistance)
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I can't get this to work get a funny icon in the top left corner of the are where the user control is suppose to appear, here is my html markup.[code]
View 4 RepliesVB6 create object of timer instead of timer control
View 5 RepliesI have several pictureboxes in my form with names as "stop0", "stop1", "stop2" ... upto a the number of checked items in my checklistbox. My aim is to use a for-next function so that the program should use for all these pictureboxes a specific image. here is the code I made so far:
Dim a As String = selectedbutton.Replace(" ", "_") & "_"
Dim c As String = ""
For n = 0 To chklstStops.CheckedItems.Count
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I have a main form that contains a vertical SplitContainer.Inside the SplitContainer's left panel, I have a TreeView control.Inside the SplitContainer's right panel, I have another SplitContainer (this one horizontal). This container is fixed, with headings above the split and a Panel control below it.I dynamically load my own user controls into the Panel control whenever the tree view changes.
Most of the user controls that are dynamically loaded have a DataGridView that should receive focus when the control is initialized. Sometimes this grid is on the UserControl surface directly; sometimes it's in a GroupBox; etc.What is the best way to programmatically set focus on the DataGridView control, given that it may placed within a variable number of control containers? I've tried the obvious - .Select, .Focus, .ActiveControl, etc. None of these seem to work - the TreeView item that I selected is still highlighted, and even though a record is selected in the DataGridView, it doesn't have focus.
Here's the code where I add the user control within the main form:
Private Sub LoadRightPanel(ByVal section As String, ByVal moduleName As String)
Heading.Text = String.Empty
SuspendLayout()
RightPanel.Controls.Clear()
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I've been working for several days on a GUI where a lot of individual data elements need to be displayed side-by-side and wrap to the next line when they overflow; the goal is to not have to explicitly design an individual 'row' element with a set number of elements for this purpose. The FlowLayoutPanel seems great, except...
I need to be able to determine how many elements are on each line (dividing the width of the control by a predetermined value indicating width of child controls does not work); I need to be able to determine how many elements will be on each line (I may need to put 4 elements on line 1, then auto-wrap, then 8 elements on line 2, then auto-wrap, then as many elements as can fit on line 3 before autowrap, then 16 elements on line 4, etc); and finally I'd really like to put a 'line header' at the left margin and a 'line footer' at the right margin, where for example the line header contains a line number and the line footer contains the number of elements on that line.
In my project i added a User Control so that i can reuse in different Windows forms.I designed and coded the UserControl1 according to my need and now i want to use it in Form2 but i cant understand how to do it?
View 2 RepliesThe leave event fires twice in this example. Tab order for the form controls is set to combobox1, button1, button3 Private Sub ComboBox1_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.Leave
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if I enter 'A' in the combobox1 then combobox1 leave event will fire twice any other entry is Ok since the next control to get focus is button2 (in the normal tab order).It seems that if I try to skip the next control (based on the tab order set for the form), the leave event fires twice.
I can't seem to find a way to use the IE9 rendering engine in the WebBrowser control, instead of the IE7 rendering engine, using Visual Studio 2010 and Windows Forms.
View 2 RepliesI am trying to read values from textbox controls and combobox controls on a form. Reading the values from textbox controls is working fine but I cannot read from the 3 combo boxes. Here is some simplified code of what I am trying to do.
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I got an error that i cant convert string to System.Windows.Forms.Control and i was wondering how could i do it this is the code that contains error:
If ResultRichTextBox.Contains("Text") Then
I have a program that I am creating in a windows form to track information about computers that I build for each project I do. The way I have my form layout is two buttons on the top of the form(1 for adding a computer and the 2nd to remove a computer) I then have a Tab window where when I want to add a computer I use the "Add button" click event to create a new tab and add a user control "Computer" that I created that contains all of the default fields that I desire (i.e. serial numbers os type, product key etc.) The "Computer" user control also contains two buttons (1 for adding a PC Card and the 2nd to remove a PC Card) The PC Card is another user control that I have created that has all of the desired fields I require for PC Cards. I am able to add new computers with no problem and name the tab
Dim b As New Computer
Dim x As String = Me.TabEquip.TabCount - 2
Dim tab As New TabPage("Computer" + x)
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I am using Visual Basic Express 2005. I am opening the startup form of my application in "Maximized" view. In the form designer, I am setting the anchor properties of the various controls that I have on the form so that they are located where I want them to be located when the Form loads.
I was wondering, if there was a way such that the form in my designer would be of the same size as the Maximized form? As of now I am dragging and resizing the edges of the Form in the Designer view to make it bigger..
In C# Windows Forms, a user control's InitializeComponent is called from the form's/control's constructor. When I create same scenario in VB.NET I don't get a constructor, and I can't locate a place where InitializeComponent is called.I need to call my code between InitializeComponent and when the control's Load event is raised, preferably still in the control's constructor. How do I do this in VB.NET?
View 2 RepliesXP WEBBROWSER-CONTROL: brings up PDF embedded in webbrowser control, as desired.XP IE7: Behaves the same if you manually navigate to URL, as desired.VISTA WEBBROWSER-CONTROL: brings up PDF by separately launching Acrobat, won't embed in webbrowser control. Not desired.Vista IE7: embeds PDF properly if you navigate to same URL, as desired.I am using Acrobat 9, where there is a preference setting under Internet to bring up PDF embedded in browser -- works fine directly in IE7, but not in webbrowser control.
View 2 Replies