well basically i created a new instance of Form1 because i do not like to use a default form instance. but of course doing so gives me 2 Form1s. is there anyway to stop the default form instance from being generated? [code]
View 11 RepliesI have a Parent form that loads a child form and I only want to allow one instance of the child form. I have this on the button to open the form. Stepping through the code with the debugger it "appears" to work OK when the form is open (I say appears because nothing changes) but when the form is closed it doesn't open as I would expect. What am I missing?
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there is The (Name) property, which represents the name of the Form class.This property is used within the namespace to uniquely identify the class that the Form is an instance of and, in the case of Visual Basic, is used to access the default instance of the form.
Now where this Default Instance come from, why can't C# have a equivalent method to this.Also for example to show a form in C# we do something like this:
//Only method
Form1 frm = new Form1();
frm.Show();
But in VB.Net we have both ways to do it:
//'First common method (used slash because editor wouldn't format it properly)
Form1.Show();
//'Second method
Dim frm as New Form1();
frm.Show();
1) My question comes from this first method. What is this Form1, is it an instance of Form1 or the Form1 class itself. Now as i mentioned above the Form name is the Default instance in VB.Net. But we also know that Form1 is a class defined in Designer so how can the names be same for both the Instance and class name. If Form1 is Class then there is no (StaticShared) method named Show().So where does this method come from.
2) What difference they have in the generated IL
3) And finally why C# can't have an equivalent of this.
I am using VB at the moment and VB has an annoying feature called "Default Form Instance", which creates a default instance of a form object when you reference the form class instead of form instance.[code]....
View 2 RepliesWhen an instantiated class calls a method in the parent form class, VB.NET starts a new instance of the form class instead of calling the method on to the active one.How do I tell it that I have just one instance of my form class, or that I don't want to create a new instance of the form and just call the method on the already active form?
View 2 RepliesI am using background worker to report progress on the screen. In the Main.vb I have the following
Public Sub report(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles bwlistener.ProgressChanged
Dim message As String = e.UserState
logRTB.AppendText(message & vbCrLf)
End Sub
When I call this from Main.vb I use:
bwlistener.ReportProgress(0, "Some status text goes here")
It works great. The problem is when I try to call it from any other module in my project.
When I call it OtherFile.vb:
Main.bwlistener.ReportProgress(0, "Some status text goes here")
It doesn't work... The program doesn't crash. Debug goes through everything but no output is actually shown to the end user.
I have two forms. A main form and then another form that you can change settings in. Now when I click on the menu item to get to the settings form I get this error. "An error occurred creating the form. See Exception.InnerException for details. The error is: The form referred to itself during construction from a default instance, which led to infinite recursion. Within the Form's constructor refer to the form using 'Me.'"I've tried these codes.
frmSettings.Show()
Application.Run(frmSettings)
those didn't work so i tried these
dim settings as new form = frmSettings
settings.show()
dim settings as form
[code]....
and those didn't work. I'm using visual studio 2010 Pro.
how to PROPERLY make a multi-tabbed or multi-window application that can handle file start requests.
For example, on startup my "Desktop Application" runs and sits there waiting for a task, either through the main menu, or for a file to display in a window. Now the problem is simple, how can I make this already running program load the dropped file (dropped on the executable (!)), instead of starting a new instance.
I understand I will have to check if the process is running, and if so, do some stuff with it. But the problem is passing the message to the active program.
Previously I used text files with paths/arguments in them, but I don't like the idea of the OS/program checking every 500 ms if a file is created in the "load this" folder...
Then I thought of sending a message using "Send Message", for example changing the text in a textbox and handle the "Text Changed" event, but is this reliable? Can any other program interfere with it?
So, basically I need the proper way of doing all of this. For example, Microsoft Visual Studio does this nicely, and no lag whatsoever...
creating single instance form in MDI Application. How to check whether form's instance created or not?
View 6 Repliesam making a super advanced text processor and i am at the point where i am trying to make print preview dialog [code] Word_Env.Form1' cannot refer to itself through its default instance; use 'Me' instead.i have tried "Me" but that don't work.
View 2 RepliesI am new to VB but am quick at learning and well I'm not one to hit a problem and just ask for help I have been search google, forums and various VB tutorials and YouTube videos trying to find how to do this with no luck.I am creating a program which will basically speed up the process of creating account at the moment I am working on a program aimed at Twitter and I am so nearly finished apart from I have hit a snag.I have 2 browsers in vb one is for Twitter and the other is url...When the verify link comes through in (webbrowser2/incognitomail) and is clicked it opens in IE when I would like it to open in one of the web browsers.I have searched so many sites and forums and found nothing on this subject
View 3 RepliesI desperately need someones help on this one, as I'm completely stumped where this error comes from.
System.InvalidOperationException was unhandled Message="An error occurred creating the form. See Exception.InnerException for details. The error is: The form referred to itself during construction from a default instance, which led to infinite recursion. Within the Form's constructor refer to the form using 'Me.'" Source="Training Database"
[Code]...
How i can set size?
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I'm a bit confused when it comes to setting the start location of a form, relative to another form.I know how to set the start location for a form, however, I have a "main" form, which is behind this form. The main form will be displaying different images, labels, ect. I need the second form to display at the bottom of the main form. The main form's resolution is 800x600, and the bottom form is 800x65. I tried to set the bottom form's location to 0,535, which WOULD make it right at the bottom of the main form, but it seems that it puts it at that location relative to the user's display resolution.So basically, I just need help with getting this form to appear at the bottom of the main form. I read a bit about "containers", but am not sure exactly if they would work for this, and if they did, how exactly I would incorporate them into my situation.
View 2 RepliesI need to make a button invisible at the start up of a VB form. However, when text is entered into an input textbox the button needs to become visible without a click event procedure. When the button to enter the text from the textbox into an array is clicked the button needs to become invisible again unitl more text is entered into the box, repeating the cycle. I have found related topics but they don't cover this.
View 4 RepliesI'am trying to write a program for projects management.It is based on MS SQL Express Server 2008 database.I have 2 forms.In first form I have list of projects (using DataGridView and showing all projects).So if user click on Project name cell second form will open with Project details (using text boxes and labels to show one project).I try something like this:
Public strValue as String
Private Sub DataGridView1_CellClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellClick
[code]....
I am trying to set a form position before it shows but i cant get it working.Form Name: ColorCentraling.vb
I've tried: Private Sub ClickNPC_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ClickNPC.Tick
[Code]...
are 2 integers which represent a number which does not need to be explained.There i've made a DIM as the form but new! I've tried settings its location but its not possible for me.I know this is possible because: I've visited many VB.NET 2008 Programs that do this
Ok so my main form takes around 5 seconds to load i can't make it so that my load subs are on a seperate thread because too many cross thread calls being made besides i want a splash screen anyway i want a splash screen on a seperate thread that can update status while main thread is loading this way main thread carries the load subs and invokes status label changes in the splash form which is on another thread
this is my code
Dim SPForm As SplashForm
Public Sub LoaderSub(ByVal Splashed As Boolean)
If Splashed = False Then
[Code]...
what happens is the splash form shows and so does the main form but they both lag for 5 seconds (as if they are both on main thread) how do i make it so that the splash form loads from the new thread? I thought the way i did it that's what should happen...
EDIT: also why did code wraps failed to show proper vb code?
I have a "Please Wait..." form that I show when doing some long task. This works quite well. But I cannot seem to control the opening position of the form. Currently I am using:
WaitWindow.StartPosition = FormStartPosition.CenterParent
WaitWindow.Show()
and this is just being ignored. The window opens at random locations. If I change it to CenterScreen, that works! But I don't want it center screen, I want it centered on the parent. Can I manually set the location? I am using VB 2008 Express and the wait form is a plain windows form.
' Show Loading Screen
--> Do anything like initializing or updating UI
' Close Loading Screen
In this case I can fire (Show Loading Screen) anywhere in the form I want,
Like
Dim LoadingScreen as New LoadingScreen
LoadingScreen.ShowLoading()
' Do things
[code]....
I want to link sql server and vb.net (ADO.NET) . I'm using visual basic 2008 express edition and sql server management studio.
My problem is how to perform a search starting from the completion of a form (in vb.net ). On pressing the button search it verifies if the records are in the table (in my case FoaieParcursMasina).
SQL Server:
Step1: Create the table and insert into them the values (full DDL):
-- creating the table FoaieParcursMasina
CREATE TABLE FoaieParcursMasina
[Code]....
In my software course, each time we submit an assignment, we have to include a document with the starting properties of each object in a form.
E.g.
TextBox1
Location: 241, 115
Name: TextBox1
Size: 100, 20
TabIndex: 0
It's a real pain to scroll through the properties viewer and copy and paste each customised value for 30+ objects on a form... I was wondering if there'd be an easy piece of code or way about getting an (at least partially) automated printout/view of all the properties of the objects.
Was thinking some sort of private sub I could past into the bottom of the program and run on load, that gets all objects, and outputs the non-default properties to a report or something?
i deleted my previous start up form to be replaced by another one but each time i launch the application,the deleted start up form is still displayed.i dont know from where this deleted start up form is being loaded.
View 3 Repliesi was wondering i have a picture box which is controlld by the keyboard, and the picture is able to leave the form. i was wondering how to stop it leaving the form without knowing the exact size of the form and using multiple points on the edge of the form.
View 3 Repliesform1 has datagridview, when I click "add new", form2 appears(details view, allowing me to add new records into datagridview on form1). when I click "add new" again, form2 appears again, if I click x times, form2 will appear x times. How do I stop the add new button and all the functions on form1 from working until form2 is closed?
View 6 RepliesIn VB.NET I've got two forms, on first one I have button, on second - two textboxes and "OK" button. I want to run procedure (Sub) on first form, then stop in the middle of it and wait for input on the second form. After that i want to process the data received from second form.
It looks something like this:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Open form2 for input
[CODE]...
The question is how to call the Form2 so that procedure is stoped till the second form is closed?
I open a form using .showdialog and load some info onto it. I have code that runs on the MyBase.Load event. Basically, I have a Try, Catch, End Try block and if the Catch executes in preparing my information, I want the form to stop loading i.e. give a message and not show at all.
View 20 RepliesI want a stopwatch thing, to start on the forst form, and stop on the last form, and to show the time.
View 2 RepliesI have been making a webbrowser for a while now, everything works well, except i am unable to make the 'open in a new window' button work right. So far i have managed to get a new instance of my form to open with the right url, but i am unable to keep that new form open when the orginal parent form closes.
Code:
Private Sub WebBrowser1_NewWindow(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles WebBrowser1.NewWindow
e.Cancel = True
Dim Href As String
[code]....
So I was wondering if anyone has done their own Forms (inheriting windows form and editing the properties) and if so, what your finished result was. And, if you are willing to post a screenshot of your finished result, that would be sweet! Trying to get some ideas of what can be accomplished with customizing the default form.
View 1 Replies