C# - What Is Startup Form Constructor
Feb 16, 2012
I need to put following code in the Constructor of my startup form.
JohnKenedy.BusinessSQLEXPRInstaller _ins = new JohnKenedy.BusinessSQLEXPRInstaller(" _ <Installation Display Name>", "localhost", "<New database instance name>", _
"<new database name>", "<database password>", "<database backup filename>");
if (_ins.IsDone == false) _ins.ShowDialog();
if (_ins.IsRestart == true) {
Application.Exit();
this.Close();
return;
}
But I really do not know what the Constructor is and how to access it?
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Nov 11, 2009
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.
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Jun 20, 2010
I can hide my startup form (or make it appear hidden) on startup. I can start my app on windows startup--through registry values--if the user checks a checkbox.
But if the app starts up on windows startup, I want the form to be hidden, so the program can just keep working without bothering anyone. If it starts up because the user started it, I want the form to be showing, because the user probably wants to change some settings or something.
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Feb 15, 2010
I have an abstract class which requires a delegate to function. I pass the delegate into the constructor. Now that I have a non default constructor I need to call the abstract class's constructors from the concrete class which means that I need to use MyBase.New(...). I have included a quick example below.
Public MustInherit Class BaseClass
Public Delegate Sub WorkMethod()
Private _Work As WorkMethod
[code]....
I have tried to do this but I keep getting the following error: "Implicit reference to object under construction is not valid when calling another constructor".Can I not do what I am trying to do above? I initially had the delegate setup in its own setter method. But then I am creating a deceptive API because it does require a point to a method to work properly.
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Nov 2, 2009
what's the rationale behind this limitation: Constructor call is valid only as the first statement in an instance constructor i want to pass an argument to my constructor which validates this argument and calls mybase.new according to this argument but it doesn't let me
example:
Public Class prob
Inherits System.ApplicationException
Public Sub New(ByVal problem As String, ByRef inner_exception As Exception)
[code]....
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Feb 28, 2012
How come when I create new instances of a form and show it, it loads the form twice?[code]...
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Nov 12, 2010
I am suppose to call a method and define it from the constructor of a form.
MSDN says this in regards to something im doing.
Whatever, does it mean?
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Jun 7, 2010
I have a MDI app that I am creating. It, of course, will have multiple MDI child forms. In each child form, I have an options button so that each child form can have it's own set of options. When I click the options button it opens an Options form. This options form is not an MDIChild.
I have a class that contains the child forms options. I pass this class to the options form using a constructor. This is how I call the options form:
Dim dlgPatternOptions As dlgOptions = New dlgOptions(thisPatternOptions)
thisPatternOptions is the class that I am passing to the Options Form.
This works fine and the options form does populate the options correctly. The Options form constructor is this:
Public Sub New(ByRef thePatternOptions As CanvasOptions)
Me.InitializeComponent()
Me.txtCanvasWidth.Text = thePatternOptions.CanvasWidth.ToString
Me.txtCanvasHeight.Text = thePatternOptions.CanvasWidth.ToString
End Sub
I change the options in the options form. How can I get those changes back to the calling form? Do I need to somehow pass a handle of the calling form to the constructor to get the changed values back to the calling form? Is there some way to pass a handle to the options form so that changes made to options will be pushed back to the calling form?
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Jun 20, 2011
CODE:
This tells me "End of Statement" is expected. I'm trying to instantiate a new form, and I'm trying to pass information into the form that I will use to populate other data fields on the form.
I've tried looking up constructors, but I can't find where my is different than other examples.
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Aug 15, 2010
I developed an app, tested on few computers and all seemed fine. But now, some people suddenly get an error, which I can't repeat on my computers. Part of the exception:
** Exception Text **
System.TypeInitializationException: The type initializer for 'NumoABC.functionsBurtuSummas' threw an exception. ---> System.InvalidOperationException:
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.'
at NumoABC.My.MyProject.MyForms.Create__Instance__[T](T Instance) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 180
at NumoABC.My.MyProject.MyForms.get_MainForm()
[Code] .....
The If Me.Created = False Then is because while the form is loading, some events fire the updatePersonDataHandlers() sub, but I don't want it to happen until form is fully loaded. In the module functionsBurtuSummas line 2
Module functionsBurtuSummas
Private f As MainForm = MainForm
I have many modules who work with the MainForms' controls, so I use a private variable f to refer to the MainForm.
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Jan 1, 2011
where can I find the default constructor of a windows form? I mean:
Public Sub New()
End Sub
I should say that I Use Visual Studio 2008 as my editor.
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Mar 23, 2011
well i successfully docked a perpixel alpha form with the main form(form1). but the perpixel alpha form always appears at the top left corner of the screen and when i move the main form the form(perpixel alpha form) inside it dosen't move it stays at the top left corner. ALWAYS. to dock the perpixel alpha form i used
Me.toplevel = false
Me.parent = form1
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Jul 2, 2009
I am using vb.net 2008 i have been using a mdi form which is the startup form for my prog. and i have a main menu on that form. now i would like to shift to tree view as my client has asked for it. whenever a node is selected i can select the form corresponding for that particular code. everything is fine till here. but when the form is loaded the tree view is coming on top of the form the tree view is docked in a pannel. now i have tried everything treemenu.sendtoback and the say the form to b called is taxtypemaster then taxtypemaster.bringtofront but still the tree view is coming over the form
I have tried the following :
Dim mMenuSelected As String = e.Node.Name
Select Case e.Node.Name
[CODE]...
Even the visible doesnt work as it seems after the .show it makes the tree view visible again. how do i hide the treeview pls. someone guide me at the earliest. i feel it is not the prob. of treeview but something to do with the mdi form am i right ?
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Oct 23, 2010
I've constructed a custom System.Windows.Forms.Form that requires arguments to New. I want to use one of these as the MainForm in a Windows Forms Application. How do I get the Application Framework to pass those arguments as needed?
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Jan 3, 2010
What I want is -
Dim filename = System.IO.Path.GetFileNameWithoutExtension(Application.ExecutablePath.ToString)
Dim openForm As Object
[Code]....
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May 23, 2011
As usual, I change the startup form under Application tab. At this time, it doesn't run my selected Startup form. Whatever I set to any forms or even excluding that form, it still runs the same form.
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Mar 31, 2009
Is there a way to get the name of startup form? I want to access a property of a control that is on startup form.
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Jul 28, 2010
VB2008 application.
Using a splashscreen.
When the spashscreen is done, the main menu for the program appears.
The problem is that the main menu appears UNDER things already open on the desktop.
Always On Top could be the answer BUT if I do that, all sub-menus will be UNDER the main menu rather than stacked on top.
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Oct 30, 2010
I continue to get this error when using the code samples from Cengage's book Zak's Programming with Microsoft Visual Basic 2008. I am running Visual Studio 2010.I am attaching the code below:
Option Explicit On
Option Strict On
Option Infer Off
[code].....
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May 16, 2011
I'm supposed to invoke the click event for the two default radio buttons when the form first appears on the screen and I did that but its giving me the following error message when I run the form.A startup form has not been specified.url..
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Oct 15, 2011
I have an problem to assign a startup form in vb.net. I have three forms:
1) Registration Form
2) Login Form
3) Main Form
Firstly i have set set startup form as registration in properties =>Application after registration completed or saved i am displaying the Login form by hiding the registration form. and entering username and password it displays the Main form. Now the twist when i exit from application next time i started to run my project where i can check if their is entry in registration form it will directly goto login form.
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May 28, 2009
make my application choose which form to startup using an IF statement. Where can I type my IF statement to make it work that way? Please explain in very simple terms.
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Jun 1, 2011
I created a VB.Net Windows Forms application and my Form1 is my startup form. I want to have a class be my startup file instead of my form. In c# you have program.cs which does that for you but I cant seem to find something like that in vb.net.
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May 25, 2009
How do I do it, I suppose it would be through properties but Im not sure where
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Aug 2, 2010
this might be a really dumb question, but if someone could enlighten me I'm writing a Winforms application in VS2008 vb.net.The application starts with a main form. I've got a status bar at the bottom of the main form, indicating the application status. I've got a 'SetAppStatus' method on the Main form.
I'm writing a class that needs to update this status. So in the class I'm Importing the Main Form. But I don't know how to call this SetAppStatus method because I don't know what the instance of the main form is called Plus am I doing this the right way? I'm still grappling a bit with how .NET all fits together and it can get a bit baffling :)
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Sep 13, 2009
I have a startform called start1 this opens a form called oppstart, I added Me .Close avter the showialog codelike this:
[Code]...
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May 12, 2009
I have a VB.net program that originally had a form. I added a module and then deleted the form, but now I get the error...
"A startup form has not been specified"
With VB6 I would change the startup object to sub main, but I can't see how to do this in the properties of the project. I tried changing the application type to console, but then I get the following error...
No accessible 'Main' method with an appropriate signature was found in 'WindowsApplication1'
How can I do this without using the original form?
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Sep 10, 2009
When developing a Windows Forms Application, I can see in the Application.Designer.vb file where Me.MainForm = Form1, but I can't find where/how Form1 actually gets newed-up.
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Feb 24, 2010
I have a VB.NET project and I want to know how I can call a class called StartUp.vb BEFORE my logon form.
Here below is the coding of Startup.vb class
[Code]...
The problem is: I couldn't find a way to call this StartUp.vb file and therefore I am unable to call my LogonUI form, I also try to "right click" the vb project and select "properties" and go to "Startup form", couldn't see the class of "Startup.vb" showing up
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Jan 26, 2009
I've got a single form application.
In the Sub New() of that form I'm creating two database classes.
In those classes if I get database errors (such as connection issues) I'm messagebox'ing the error message and setting an ERRFLAG property.
Back in the Sub New() I'm checking that ERRFLAG and I thought I could ME.CLOSE() - but that's not working.
What all is best practice for this type of operation?
This is what I had up to now
Sub New()
Me.CMCStarting = True
' This call is required by the Windows Form Designer.
[Code]....
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