System.Windows.Forms Sequence Of Events

Oct 6, 2009

Which form events fire when a form is minimized, restored and maximized.I am trying to draw lines on a PictureBox control, but cannot get the draw subroutine to run after the form has been restored from a minimized windowstate.I probably should know this answer, but I have not written much code in the last 4-5 years and am relatively new to vb.netAlso.

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When Using Mouse Events And E As System.Windows.Forms.MouseEventArgs

Oct 12, 2010

When I use e.X or e.Y I get the X,Y coordinates of the mouse and it works fine.But when I use e.Button I get long numbers.

Button 1 = 1048576
Button 2 = 2097152
Button 3 = 3145728
And so on...

Why does it return these large numbers? Why not 1, 2, or 3?Is there more data in those large numbers?

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Implicit Conversions From 'System.Windows.Forms.Control' To 'System.Windows.Forms.Webbrowser'

Sep 8, 2010

I 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

[Code]...

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Cannot Import System.Windows.Media.Imaging And System.Windows.Forms Or System.Reflect?

Mar 16, 2009

With the following imported namespaces in my project :

Imports System.Windows.Forms
Imports System.Reflection
.. I cannot add..

[code].....

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Unable To Cast Object Of Type 'System.Windows.Forms.Button' To Type 'System.Windows.Forms.TextBox'

Apr 28, 2009

I have a panel with some controls in it (several textboxes, a slider, 2 buttons, and a small groupbox).. When I click a button, I want all of the textboxes within the panel to be readonly... So I have this code: [code] When I run it though, I get the following error:Unable to cast object of type 'System.Windows.Forms.Button' to type 'System.Windows.Forms.TextBox'.If I remove a button, it moves on to give me the same error but for a label..

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Forms :: Error - An Unhandled Exception Of Type 'System.StackOverflowException' Occurred In System.Windows.Forms.dll

Apr 14, 2011

An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll it also says make sure you do not have infinate loop or infinate recursion il give all code in order that they are executed in Check the chechbox and it disables all irelevent stuff and populates the combobox

Private Sub CheckBox_Spray_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox_Spray.CheckedChanged
If Me.CheckBox_Spray.Checked = True Then

[code]....

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Error - Base Class 'System.Windows.Forms.Panel' Specified For Class 'MenuButton' Cannot Be Different From The Base Class 'System.Windows.Forms.UserControl'

Mar 12, 2010

When I do this

Public Class cInherits : Inherits Panel

I get this: Base class 'System.Windows.Forms.Panel' specified for class 'MenuButton' cannot be different from the base class 'System.Windows.Forms.UserControl' of one of its other partial types.

How do I inherit?

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Unable To Cast Object Of Type 'System.Windows.Forms.Label' To Type 'System.Windows.Fo

Jun 12, 2011

i need to get data from checkbox in a groupbox. in the groupbox, it also have a label. so my coding as below

[Code]...

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Changing The Viewing Sequence For Events?

Mar 3, 2009

I am working on an application with about 50 controls and want to arrange the events so that I can find them easier. There are several events for each control and since they wer all created at different times code for controls is in order by date created.

I want to change the order. Naturally I want to avoid cutting and pasting.

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VS 2005 Sequence Of Events In Web Browser?

May 12, 2010

I'm relatively new to vb.net. I just created an simple Electronic Raffle web application via Visual Studio 2005. It's working just fine since it just basically returns a random winning entry queried from an SQL Server database. However, to make the raffle draw more "dramatic", I would like display random entries before actually displaying the winner. I tried creating a for-loop which displays random numbers before displaying the winning entry but only the end result (winning entry) is displayed.

I even tried to display an animated gif file then hide it again before displaying the winning entry but only the winning entry is displayed when I click on the "Draw Winning Entry" button.Is there a way to set the sequence of events in a web browser such that the program should display the image first then hide it after 5 seconds then display the winning entry afterwards?

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Operator '*' Is Not Defined For Types 'System.Windows.Forms.VscrollBar' And 'Systems.Windows.Forms.VscrollBar

Oct 29, 2011

I am trying to use values from form1 in my project, in form2, but Im not sure how to do it. I've tried

txtboxTotal = (Form1.vsbLength * Form1.vsbWidth) * Pattern

But I get: operator '*' is not defined for types 'System.Windows.Forms.VscrollBar' and 'Systems.Windows.Forms.VscrollBar.'

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Value Of Type 'System.Windows.Forms.WebBrowser' Cannot Be Converted To 'System.Window

Jan 23, 2010

Private Sub wb_Scrape(ByVal sender As System.Object, ByVal e As

[Code]...

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'System.AccessViolationException' Occurred In System.Windows.Forms.dll Immediately Before Entering A Click Handler?

Oct 20, 2010

Win7 64 bit; fully patched VS2008 targeting FW2.0; VB.Net; running in Debug Mode (not tested in Release mode)I have a resonably complex app which I am refactoring a bit. As part of that, I relocated some code from a subroutine into a Click Event Handler. The Event Handler will, late in the handler, call the, reduced in function, subroutine. The point of this is thatNow when I click the button associated with the modified Handler I get:A first chance exception of type 'System.AccessViolationException' occurred in System.Windows.Forms.dll<br />With Error System.AccessViolationException Attempted to read or write protected memory.This is often an indication that other memory is corrupt.

at MusicManager2009.frmMain2.cmdLoadAlbum_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)

[code].....

All functions of the app, except those that start from the buttonclick in question, work as before in the problem version.The problem persists after rebuilding the entire solution, after restarting VS, and after rebooting the PC.

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Error - An Unhandled Exception Of Type 'System.StackOverflowException' Occurred In System.Windows.Forms.dll

Feb 19, 2010

When I run my project I get "An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll"

Public Class frmViewReport
Dim objForm As New frmViewReport
Private Sub frmViewReport_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
objForm.ViewReport("C:a2.rtp", , "@parameter1=test�mter2=10")

[code]....

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Error : A First Chance Exception Of Type 'System.ArgumentException' Occurred In System.Windows.Forms.dll

Nov 16, 2009

I have the following code running, the first time I change the selected index, everything runs smoothly. However, if I try to change the selected index again, nothing happens and the subcategories combobox values do not change.

Private Sub cboMainCategory_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboMainCategory.SelectedIndexChanged
'* make sure the combobox is fully loaded

[code]....

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Error : An Unhandled Exception Of Type 'System.ArgumentOutOfRangeException' Occurred In System.windows.forms.dll

May 6, 2009

I keep getting an eroor this error says: An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in system.windows.forms.dll Additional information: Specified argument was out of the range of valid values.

Option Strict On
Public Class frmWeeklyReport
Inherits System.Windows.Forms.Form

[code].....

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VS 2008 : A First Chance Exception Of Type 'System.InvalidOperationException' Occurred In System.Windows.Forms.dll

Feb 12, 2011

A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll It displays in my Immediate Window when i run my program, I'm using a text reader to read a number of XML files using background worker...most the time it stops so something is wrong but sometimes it works fine.

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Collect A Sequence Of Events In A Variable Of Some Sort

Jul 31, 2011

In my program; I need to collect a sequence of events in a variable of some sort. Each time the Sub is initiated, it should add one random event to the sequence (so that it gets longer each time) and then run through the sequence.This is rather difficult to express.What I'm trying to do, is create a Simon Says game with the four buttons.After the sequence goes through blinking the buttons, the program must then be able to capture the sequence of button presses by the user and match that to the sequence that the program ran.So, I need to be able to keep track of two sequences in a variable. Arrays?

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Error:A First Chance Exception Of Type 'System.Reflection.TargetParameterCountException' Occurred In System.Windows.Forms.dll

Feb 6, 2010

I am working on a card game, and i get this werid error:

A first chance exception of type 'System.Reflection.TargetParameterCountException' occurred in System.Windows.Forms.dll

The code that is cousing this error is:

Private Delegate Sub ShowcardDelegate(ByVal test As String, ByVal objtest As Object, ByVal value As Boolean)
Private Sub Showcard(ByVal test As String, ByVal objtest As Object, ByVal value As Boolean)
If objtest.InvokeRequired Then

[code].....

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Cast A System.string To System.windows.forms.form?

Feb 23, 2009

I want to cast a system.string to system.windows.forms.form

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Forms :: String Cannot Be Converted To System.windows.forms.label

Mar 31, 2010

I am writing a program for my A-level coursework But for some reason I got this build error this has never occurred to me before, I have no idea why I can't use string for the name of my form.

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Inherits System.Windows.Forms.Form Is Missing In New Forms?

Mar 5, 2012

When I add a new, empty form to my VB.NET VS9 project, the linenherits System.Windows.Forms.Formis missing.What am I doing wrong here?I thought it would be added automatically.I experienced that some thing get weird if this line is not there (Form_Load is not firing, I think).

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IDE :: DataGridView1_CellLeave(sender, New System.EventArgs), Unable To Cast Object Of Type 'System.EventArgs' To Type 'System.Windows.Forms.DataGridViewCellEventArgs'.

Jun 27, 2011

VB 2008, DataGridView,DataGridView1_CellLeave(sender, New System.EventArgs)

"Unable to cast object of type 'System.EventArgs' to type 'System.Windows.Forms.DataGridViewCellEventArgs'."

What is the Correct String for "New System.EventsArgs"

Anybody there is to help me out.

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Treeview Node "Error 1 Value Of Type 'System.Windows.Forms.TreeNode' Cannot Be Converted To 'System.IO.SearchOption'"

Jan 17, 2011

[Code]...

there is one problem here the root node on the line "GetDirectories(info.GetDirectories(0, rootNode))" here is the error "Error 1 Value of type 'System.Windows.Forms.TreeNode' cannot be converted to 'System.IO.SearchOption'."

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VS 2010 Unable To Cast Object Of Type 'System.Windows.Forms.MouseEventArgs' To Type 'System.ComponentModel.RunWorkerCompletedEventArgs'

Jun 25, 2010

My project worked a first and now its giving me a problem.The error

Quote:

Unable to cast object of type 'System.Windows.Forms.MouseEventArgs' to type 'System.ComponentModel.RunWorkerCompletedEventArgs'.

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Error : Unable To Cast Object Of Type 'System.EventArgs' To Type 'System.Windows.Forms.KeyPressEventArgs'

May 16, 2011

[URL]The issue is as soon as I change the value of the text boxes it gives me an error and forces me to close the project.

The error is:Unable to cast object of type 'System.EventArgs' to type 'System.Windows.Forms.KeyPressEventArgs'.

However I'm supposed to clear the number of gallons used and the total charged when a change is made to the contents of the 2 text boxes on the form.

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Unable To Cast Object Of Type 'System.String' To Type 'System.Windows.Forms.TextBox'

Jun 12, 2011

Unable to cast object of type 'System.String' to type 'System.Windows.Forms.TextBox'.

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System.Windows.Forms In 3.5?

Apr 6, 2009

I'm trying to implement a website screen shot class as described hereThe class imports the following methods

Imports System
Imports System.Drawing
Imports System.Drawing.Imaging

[code]....

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Keep Getting A "System InvalidOperationException Occurred In System Windows Forms Dll" Error

Jun 7, 2010

I've just started learning VB.NET with VS 9.0; a small application I'm working on keeps returning an "A first chance exception of type System InvalidOperationException occurred in System Windows Forms dll" error from the Immediate Window. The application has almost zero functionality so far, it consists of a menu strip with:

File About
|Open
|Save
|Save As
|Quit

The only code I have written opens an Open File dialog, a Save As dialog, an About window with background sound and an OK button, and the Quit button which exits.

Since there is almost no code for me to search through, I can't understand why there would be an error. The program runs just fine when I'm debugging it too.

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VS 2008 Difference Between System.Timers.Timer And System.Windows.Forms.Timer?

Jun 15, 2009

I'm wondering what exactly is the difference System.Timers.Timer and System.Windows.Forms.Timer???

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