I am trying to check one condition when i m checking a particular checkbox.below is the code
Private Sub CheckBox4_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox4.CheckedChanged
If CheckBox4.Checked Then
check_CL()
End If
i put one debugger to check whether the control is going to this event or not but it's not going.please tell me what is the problem..
From your arguments it looks that you have performed appropriate steps. I would suggest that you should look for this piece of code:
RemoveHandler CheckBox4.CheckedChanged, AddressOf CheckBox4_CheckedChanged
It is possible that you have unregistered handler somewhere in code either in .vb or .designer.vb
Have you tried using the full code to see if it works?
If CheckBox4.Checked = True Then
check_CL()
End If
Related
So i have a tray icon that should behave the same way between 3 forms. I then created this code:
Private Sub TrayForm_MouseClick(sender As Object, e As MouseEventArgs) Handles NotifyIcon1.MouseClick
If e.Button = MouseButtons.Right Then
If Not Application.OpenForms().OfType(Of TrayForm).Any = 1 Then
TrayForm.ContextMenuStrip1.Show(Cursor.Position)
End If
End If
End Sub
Which is used to handle the tray icon. How can i do to share this event between the forms so i don't have to place this same code on every form?
How are event handlers working exactly? I looked online and on MSDN and it is not clear to me.
Thanks
Are you sure that you want to share the event, and not juste the code that will handle the event?
If you don't want to copy and paste your code, which you need to handle the events of more than one form, here's a way to do it:
Declare the sub which contains the code needed to handle the event as a public shared sub. Like this:
Public Shared Sub TrayForm_MouseClick(sender As Object, e As MouseEventArgs)
So, now you have a Sub which can handle the event you want to handle from all three forms.
Now, when you initialize those forms, add a line to make the shared Sub handle the event you want it to handle:
AddHandler NotifyIcon1.MouseClick, AddressOf ProjectName.FileName.TrayForm_MouseClick
ProjectName.FileName is meant here to be the path to refer to the shares Sub inside the file where you put it. I usually name it like ProjectNameUtils.vb or something like that.
If you just want to avoid copy and pasting your Sub so you don't have to modify it at several places every time you change something, this could be a way to achieve that.
As Stipulated by Hans Passant:
Sub Eclass_EventHandler(sender As Object, e As MouseEventArgs) Handles Me.MouseClick
If e.Button = MouseButtons.Right Then
If Not Application.OpenForms().OfType(Of TrayForm).Any = 1 Then
Me.ContextMenuStrip1.Show(Cursor.Position)
End If
End If
End Sub
On the Trayform.VB just did the trick.
But about the shared event. i Have one that would have to be:
Private Sub FormClosingEVENT(sender As System.Object, e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
If Not FromMenu Then e.Cancel = True
Me.WindowState = FormWindowState.Minimized
'Application.Exit()
End Sub
How should i handle this?
I'm using Visual Basic 2010, and within my form shown sub I need two buttons to be pressed , however I need the first button's code to complete before the moving on to pressing the next button. Is there any way to allow this to happen? Thanks :)
Private Sub Form1_Shown(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Shown
BindingNavigatorMoveLastItem.PerformClick()))
'I need this next button click to be carried out after the one above has completely finished
BindingNavigatorMovePreviousItem.PerformClick()))
End Sub
Use methods instead of "button-clicks":
Private Sub Form1_Shown(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Shown
MoveLastItem()
MovePreviousItem()
End Sub
Private Sub MoveLastItem()
bindingSource1.MoveLast();
End Sub
Private Sub MovePreviousItem()
bindingSource1.MovePrevious();
End Sub
You just have call these methods from the button-click events handlers as well.
Private Sub BindingNavigatorMoveLastItem_Clicked(sender As Object, args As EventArgs) Handles BindingNavigatorMoveLastItem.Click
MoveLastItem()
End Sub
Private Sub BindingNavigatorMovePreviousItem_Clicked(sender As Object, args As EventArgs) Handles BindingNavigatorMovePreviousItem.Click
MovePreviousItem()
End Sub
I must admit I don't do VB, but I came across this page and it might be useful to you.
http://msdn.microsoft.com/en-us//library/system.windows.forms.application.doevents.aspx
If that is not relevant, in your situation I would either use the buttons to set flags and simply if-test the flags, or create a do-while loop so that the code can finish executing while the conditions are met. Careful with those, however, as infinite loops are something they are good at.
Another thought is to enable the second button in the last line of the code of the first button?
Hope something helps. Apologies if it is of no use.
I have a function that is called twice and I don't know what to do.
This is the code that is called when I press an input button on a WebBrowser:
Private Sub WebBrowser_DocumentCompleted(ByVal sender As System.Object, ByVal e As WebBrowserDocumentCompletedEventArgs) _
Handles WebBrowser1.DocumentCompleted
Document = sender.Document
AddHandler Document.Click, New HtmlElementEventHandler(AddressOf Document_Click)
End Sub
Private Sub Document_Click(sender As Object, e As HtmlElementEventArgs)
Select Case Document.ActiveElement.Id.ToLower
Case "global" : prueba()
Case Else
End Select
End Sub
If you want to see the function called prueba() here it is: http://pastebin.com/Fi5LLX2N
I have a video where I show it, but the annotations are in Spanish: http://www.youtube.com/watch?v=OCJXk3qJwVA
Well I have another problem with my function, as you can see, on the bottom I have put this:
Else
MsgBox("Este ModPack ya lo tienes instalado!")
End If
But it doesn't work. :(
Try this:
PS: It's written on the fly maybe can have some syntax error.
Private Sub WebBrowser_DocumentCompleted(ByVal sender As System.Object, ByVal e As WebBrowserDocumentCompletedEventArgs) _
Handles WebBrowser1.DocumentCompleted
Document = sender.Document
try : removehandler Document.Click, addressof(Document_Click): catch : end try
AddHandler Document.Click, New HtmlElementEventHandler(AddressOf Document_Click)
End Sub
My immediate reaction is a sticky mouse button, but really it's likely due to the web page you are loading having multiple pages being loaded, thus adding the duplicate event handler. Put a breakpoint on this line of code:
AddHandler Document.Click, New HtmlElementEventHandler(AddressOf Document_Click)
You'll likely see it being hit twice. Make sure to only wire up one HtmlElementEventHandler to avoid the double firing of the click event handler. You can check e.Url for a match before wiring up as a possible solution.
in vb.net there is no need to define onclick in html for button because it is handled automatically.so if you are doing this then the click event will fire twise.
I have to do the following for each textbox control.
If e.KeyCode = Keys.Enter Then
Me.DateDateTimePicker.Focus()
End If
Should there be a For Next loop option, pls mention under which Sub Routine I should code the loop.
From what you're saying, I think this should be placed within the KeyPressed event within the text box you are trying to run this piece of code from. You can also integrate multiple events for many controls into a single method.
Hope this helps!
You can but your code inside a 'KeyUp' event and then alter the 'KeyUp' event of one textbox to handle more than one textbox keyups event, but only one code can be executed for all of them,
check this:
Private Sub ***TextBox1_KeyUp***(ByVal sender As Object, _
ByVal e As System.Windows.Forms.KeyEventArgs) _
Handles TextBox1.KeyUp, ***TextBox2.KeyUp***, ***TextBox3.KeyUp***
'*************
'Write your code Here
'*************
End Sub
As others said, you can use only one method to handle multiple events.
Moreover, you can execute sender-customized code:
Sub MyEventHandler(sender as Object, e as Event) Handles obj.ev, obj2.ev, obj3.ev
'Use sender property (properly casted, if necessary)
'to run sender specific code
DirectCast(sender, TextBox).Text = "foo"
End Sub
Hello here is what i want to do:
Private Sub UpdateButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles UpdateButton.Click
MyUpdate.CheckUpdate("version.txt")
If MyUpdate.CurrentVersion < MyUpdate.UpdateVersion Then
'IF USER PRESS THE BUTTON TO RAISE EVENT ONE MORE TIME
Else
'DO NOTHING
End If
End Sub
I don't know how to raise an event within an event. Thank you!
Intuitively enough, you use the RaiseEvent keyword.
More explanation about raising and consuming events in VB.NET can be found here on MSDN.
But in this case it's probably better to refactor your code and extract the logic out of event handler method into another function.