Elevator Simulation System

Feb 21, 2010

where can i refer this system. this system consist on elevator location, the level that the consumer need to go and others.


Simulation Of Double Click?

Apr 7, 2009

if you can simulate a "double click" when you click a button. What I mean is that,

1 - you click on the button,

2 - the button behaves as if it were clicked twice.

I need this because for some reason, some of the buttons on my form that give focus to a PDF reader need to be clicked twice in a row to work. I think this is because with the component, there are different areas to give focus, but you can only just say "AxAcroPDF.Focus" .

Can I simulate a "double click" on the action of a single click?

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Dice Roll Simulation With Rnd Function?

Apr 9, 2009

dice roll simulation with Rnd function

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Forms :: Game Of Life Simulation?

Feb 28, 2011

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim x, y As Integer


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How To Use Raw Input With Simulation Ondevice Arrival Events

Nov 8, 2011

I wish to use raw input  on an application that i know accepts it and simulate ondevicearrival events for a physical hardware device so i dont have to plug it in to test on device arrival. I can find the pid and other hardware specific numbers if needed for the simulation but im really just wanting to simlulate multiple mice for ondevicearrival. 

Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. - "Sherlock holmes" "speak softly and carry a big stick" - theodore roosevelt.

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Building Arena Simulation Model With External Program?

Jan 13, 2012

I have a requirement to construct a Arena simulation model using an entirely separated external VB program, instead of using the build-in VBA programming capabilty. I have some progress on building such program, but not satisfied with the behavior.

Is it possible to create a Model without starting the Arena.exe?If the program halt for any reason (such as termination of debugging) during the model creation steps, the subsequent call to the CreateObject function failed with result like "Cannot create ActiveX/Com objects". This error still occurs even if I manually kill the Arena.exe via the Task Manager. How to avoid this?

-- Current Code --

arenaApp = CType(CreateObject("Arena.Application"), Arena.Application)
arenaModel = arenaApp.Models.Add


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Duplicate Concept, Industrial Simulation Program To VB Conversion?

Jul 19, 2009

I am trying to convert an industrial simulation program to a VB program There is one hard concept that I have problem with, it is called "Duplicate" Ex: When 1 person pass the duplicate block A, then 2 persons comes out, (that person is cloned). 1st person goes path 1, has delay time of 1 hour. 2nd person goes path 2, has delay time of 2 hours. At the end of the 1st hour, 1st person arrives at the detour, at the end of 2nd hour, 2nd person arrives at the detour, but 1st person already moves on to the next task for an hour.

So you can consider them doing their separate tasks simultaneously. Then complication comes in when somewhere down the path, 1st and 2nd person pass another duplicate B, then total of 4 persons will run into their own separates paths and delays. Then they will come back to the starting duplicate block A, thus creates total of 8 persons and follow the same path above again.

Until some condition has been met (ex: total number of persons pass through duplicate B), then all of them will leave the system.Anyone has any idea what is the best way (logically easy to follow) to program the concept? I hope I explained it clearly. It's unfortunate that MSDN doesn't allow attaching image or video.

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Interface And Graphics :: Simulation Of A Light Source And Mirrors

Jan 6, 2011

I am trying to do is to draw a ray of light emitted by a light source and it is going to be reflected mirrors. I rotate the emitter and mirrors and the ray of light shold obey the laws of reflection. The emitter and mirrors are in an opaque room which means light should not go out. Where I am now is that I am able to draw the ray but when the angle is 90 degrees ( +or-) all the drawing disappears. I set some conditions to make up for this situation, but it does not seem to work. Besides if the angle exceeds 90 degrees, the line is drawn in the opposite direction.One other thing that happens is I set the ray to stop when either end_x_emitter_ray or end_y_emitter_ray = 500. It works for the end_x_emitter_ray but not for the end_y_emitter_ray[end_x_emitter_ray and end_y_emitter_ray are the point where the ray end]I have uploaded the my whole code here. Can you guys suggest me what can be done to make it work appropriately?

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Building A Airline Simulation Game Whereby Users Create An Run An Airline?

Jun 25, 2010

I'm looking at building a airline simulation game whereby users create an run an airline, I just want to ask something that will possibly be very simple but it's going to be very complicated answer i think.for every aspect of my game do i have a class to create an object, for example

City: (I'll have a class called myCity and each time i look at a city it goes to that class creates an object and I use it then dispose of the object)Airplane: (make model etc) How about bigger items such as Bank is bank it's own class or are items inside the bank the object?

How about competitors, i guess each one is it's own object? i would never dispose of them, how would I store them form each user session to another?

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Elevator Project - Includ Panel With Floor, Available Floors, And A Button Panel With Available Floors And Button Up, Down

Dec 15, 2011

I have trying to do an elevator simulator, wich have to includo the panel with the floor, available floors, and a button panel with available floors and button up, down, but I dont understand is how to use the timers for up and down, because I vague idea to select the floors is to usea a for or select case but I dont know wich one is the most appropiate in this case. Wha tI have so far is:

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Timer2.Enabled = False
If lbl1.Text = "4" Then
lbl1.Text = "1"

This just shows the levels and the timer1 just go up and a little "screen" shows at what floors is the elevator but this just go up and start from one again.

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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..


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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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Error - LINQ To Entities Does Not Recognize The Method 'System.Object IIf(Boolean, System.Object, System.Object)'

Jul 29, 2011

I am getting following error whenever I want to use IIf function inside entity framework query.

LINQ to Entities does not recognize the method 'System.Object IIf(Boolean, System.Object, System.Object)' method, and this method cannot be translated into a store expression.

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Method 'System.Object CompareObjectEqual(System.Object, System.Object, Boolean)' Has No Supported Translation To SQL.?

Apr 16, 2010

What do I need to convert?

Dim CEESearchByAppNo = From CEEsearch In dbCEE.tblScanneds _
Where CEEsearch.AppNo = iAppNo


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Unable To Cast Object Of Type 'System.String' To Type 'System.Predicate`1[System.String]

May 13, 2009

I am getting the following erro message: "Unable to cast object of type 'System.String' to type 'System.Predicate`1[System.String]'." on the line of code: If Not StrgFrag.Exists(wrd) Then I was expecting a True/False response and assumed it would work given that wrd is a String variables and StrgFrag in a List(of String). Do I need to reference the wrd variable differently? Dim StrgFrag As New List(Of String)


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Error: A First Chance Exception Of Type 'System.InvalidOperationException' Occurred In System.Data.dll

May 5, 2011

I am using VS 2008, Office 2007, and Win7 Home Premium on my system.I have a simple application which should be a breeze to build. All I am attempting to do is pull data from an Access database with four small tables into a data grid on a windows project. Should be simple, set up the data connection, choose a datagrid from the table in the data source view, drag it onto the page and done, right?I can't get it to work.  It will all work fine until I attempt to run or debug the project.  The data will not show up.  The data grid does, but I get this error: A first chance exception of type 'System.InvalidOperationException' occurred in System.Data.dll

As I said, the project seems to build fine, but it will not pull the data.  After the initial build I get the message that Windows will show this page in Compatibility View. Is it something with Win7 Home Premium, or a setting somewhere? 

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System.io.fileinfo Cannot See A File In System Folder On Windows Server 2008 64bit

Jan 28, 2010

I have a utility that is a simple exe that is not installed compiled with VS2005 and works well. But when I upgraded to VS2008 the utility can no longer locate files in the active system folder. I have UAC turned off and am logged in as the Administrator and it still can not locate a file that I can see in Windows Explorer. The file I am looking for is PakMgr.exe.

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System.TypeInitializationException: The Type Initializer For 'System.ServiceModel.ClientBase' 1' Threw An Exception

Dec 22, 2009

I'm using express 2008 build the windows app. and in the app, it calls a webservice which was built by VS2003.It works fine on most PCs. however, there is one PC, it always shows this error:

System.TypeInitializationException: The type initializer for 'System.ServiceModel.ClientBase' 1' threw an exception
System.configuration.ConfigurationErrorException: Configuration system failed to initialize ---> System.Configuration.ConfigurationErrorsException:
Unrecognized configuration section system.serviceModel

however, the configuration file was generated by express 2008, and it seems there is no error.

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Unable To Cast Object Of Type 'System.EventArgs' To 'System.ComponentModel.CancelEventArgs'

Jul 11, 2012

I have a text-boxes that use both the validating event as well as the lostfocus event.I have pinpointed the exception in the post title to the validating events.[code]Maybe I am unaware that CancelEventArgs are not suppose to be used in the validating event? [code]

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VS 2008 : Error - Cannot Perform 'Like' Operation On System.Int32 And System.String"

Nov 2, 2009

I'm trying to use DataView.Rowfilter and I'm getting an exception which says "Cannot perform 'Like' operation on System.Int32 and System.String".

Here's the code...

Dim str2 As Double = CDbl(searchSTR)
Me.shipperDV.RowFilter = fieldName & " LIKE '*" & str2 & "*'"

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A First Chance Exception Of Type 'System.UnauthorizedAccessException' Occurred In System.DirectoryServices.dll

Dec 16, 2010

I would like to create a local user on a windows 7 PC, but gets the following error when commitchanges runs. I am administrator on the PC:

A first chance exception of type 'System.UnauthorizedAccessException' occurred in System.DirectoryServices.dll

Here is my code:


I am using Visual Basic 2010 ultimate in Visual Studio 2010.

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C# - What Could Cause System.Timers.Timer.set_Enabled Property To Throw A System.NullReferenceException

Apr 4, 2012

Here is the stack trace:

2012-03-16 19:15:09Z E System.NullReferenceException: Object reference not set to an instance of an object.
at System.Timers.Timer.set_Enabled(Boolean value)
at System.Timers.Timer.Stop()

Here's the code:

Timer declared as private member variable.
Private _myTimer As System.Timers.Timer
Initialize timer method.


The timer has to have a value or else the Timer.Stop() call would be throwing the exception. This is a sporadic error and I'm just trying to see if anyone has experienced this before or if anyone has any ideas of what could be causing it. It is occuring in a WinForms application in the event handler for the Elapsed event of the Timer, but it is only occuring sporadically on the users computer. I haven't been able to reproduce the error myself.

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DB/Reporting :: Error: Cannot Perform '=' Operation On System.Int32 And System.String

Mar 6, 2010

I wrote the code below which calculates the length of a line on the form and save record. An error occurs when the programme tries to save the record. It gives me "Cannot perform '=' operation on System.Int32 and System.String" error. I checked the data type of "ID"(int), "Microscope"(Varchar), "Magnification"(int) and "Calibration"(Decimal), and they are fine so far as I know.

Private Sub btnEnd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEnd.Click
'Check if the length textbox is not empty


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

Mar 21, 2011

get out from the below loop

Shared Function GetIPAddress() As String
Dim sam As System.Net.IPAddress
Dim sam1 As String


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Exception Of Type 'System.ComponentModel.Win32Exception' Occurred In System.Drawing.dll

Oct 14, 2011

I have a program that creates a Treeview from information procured through an ODBC query and dumped into a dataset. I have three such queries set up via radial buttons as well as a refresh button that triggers whatever radial button is active at the time it's clicked. The purpose of this program is to allow drag-and-drop of selected nodes, ending with a post to the database that officially makes that change of assignment to the new node.


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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


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VS 2005 Develop A Project For Attendence System Through Finger Recognition System

Apr 21, 2011

a company offered me to develop a project for our attendence system in which finger recognition system is used. now i have quitely no idea that what i do and what do i do with this finger recognition system project.

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VS 2008 System.IO.FileNotFoundException: Could Not Load File Or Assembly 'System.Core

Feb 15, 2010

I have finished coding an application which I designed for people working in my office. When I started to install the application to computers at the office, I realized that, in some machines, application doesn�t work properly. Although it worked for 15 computers perfectly, for 3 computers following error code is displayed:

System.IO.FileNotFoundException: Could not load file or assembly 'System.Core, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.


WRN: Assembly binding logging is turned OFF.To enable assembly bind failure logging, set the registry value [HKLMSoftwareMicrosoftFusion!EnableLog] (DWORD) to 1.

Note: There is some performance penalty associated with assembly bind failure logging.To turn this feature off, remove the registry value [HKLMSoftwareMicrosoftFusion!EnableLog].

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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)


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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Avoid System.Runtime.InteropServices.COMException By Detecting A System Folder Before Writing A File?

Nov 26, 2010

I have a vb .net application where the user can choose a directory into which an excel file is written. If the user selects a system directory (yes, my users do this, don't ask me why) then a System.Runtime.InteropServices.COMException is thrown at runtime. I am handling this exception telling the user to please select another directory.

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Cant Count System String - Evaluate Exception Unhandled "Cannot Perform '=' Operation On System

Nov 3, 2009

Here is the code I am working with, everything works fine up until last line then i get evaluate exception unhandled "Cannot perform '=' operation on System.Int32 and System.String." My eyes are going blind trying to figure out whats wrong, if I understand correctly it cant count system string and REO is a string value.

The thing i have done this before ,count that is. I know you cant average strings and some other function but i have been able to count.

d Dim comm As New OleDb.OleDbCommand("Select * From " & Me.OpenFileDialog1.SafeFileName & " Where Status  <> 'S'", con)
  Dim dalist As New OleDbDataAdapter(comm)
  Dim comm1 As New OleDbCommand("SELECT * FROM " & Me.OpenFileDialog1.SafeFileName & "  Where Status


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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")


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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


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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


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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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.net - The System.Linq.Dynamic Namespace - Visual Studio Does Not Recognize In The Project Files The System.XXX References

Aug 11, 2011

I would use the System.Linq.Dynamic. I added the specified Dynamic.vb file, that starts like this:


to my (VB.NET)solution. Now Visual Studio does not recognize anymore in the project files the System.XXX references, proposing me to change them to Global.System.XXX

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C# - .NET WinForms - Listen To Events For System LogOff - User Locked - Hibernate Started And System Resumed?

Feb 11, 2010

I want to listen to events in my windows forms .NET application for the following system wide events :


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Error - Soap Serializer Does Not Support Serializing Generic Types : System.Nullable`1[System.DateTime]

Oct 2, 2009

Im working on my first n-tier application.  I am trying to serialize a structure and Im getting an error"Soap Serializer does not support serializing Generic Types : System.Nullable`1[System.DateTime]."Here is the structure that is being serialized
Namespace Structures

<Serializable()> _
Public Structure structAllergy
Public AllergyID As String
Public ProfileID As String


The bold line is the line that is throwing the error.

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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


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System.Exception: Unexpected Return Code: 1 At System.Data.OracleClient.DBObjectPool.GetObject Error

Jul 13, 2010

I have a windows service written in .NET 2.0 that will run every 5 minutes and executes bunch oracle SQL/PLSQL scripts based on time/validation, it throws the above said error some times against some SQLs, the same SQLs run fine at later point without any error, I have no idea what is going on with the app. I am not sure if this has any thing to do with oracle connection pool as I am properly closing the connections after every SQL execution.


System.Exception: Unexpected return code: 1 at System.Data.OracleClient.DBObjectPool.GetObject(Object owningObject, Boolean& isInTransaction) at System.Data.OracleClient.OracleConnectionPoolManager.GetPooledConnection(String encryptedConnectionString,


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