Write Simple VB Code With *= Operations

Apr 18, 2010

I've designed a Arithmetic Calculator. I can get my additon button to work but not my multiplication button. My result total comes back as 0.


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Multiple Operations With A Simple Calculator?

Jul 31, 2011

I've got the bulk of a calculator up and working, however it doesn't like multiple operations. For example 3x5+2= brings up 10 (i.e. 3+5+2) and even doing it in two parts doesn't help, if I enter 3x5= I get 15 then +2= gives me 32 (i.e. 3x5=15 15x2=30 30+2=32). Also I am getting trialing zeros in my command line I can't debug.Note that lblcommandline displays the whole function and lbldisplay just displays the current imputted number.

Public Class frmSimpleCalc
'This code is run when the program starts. Here we 'declare' or basically, define which variables we want, what they are and such.
'So, for this example, we need two variables. The number we are CALCULATING and the one which we will CALCULATE FROM.
Dim lCalcNumberMaster As Long 'The master number is the solution, the number stored and displayed when we click equals.


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Why Do Simple Math Operations On Floating Point Return Unexpected (inaccurate) Results In .Net And Python

Oct 20, 2009

x = 4.2 - 0.1
vb.net gives 4.1000000000000005
python gives 4.1000000000000005
Excel gives 4.1
Google calc gives 4.1

What is the reason this happens?

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Text File Read/write Operations?

Nov 29, 2010

I am currently working on an application which requires reading, writing and modifying data from a TEXT file. I have searched a lot but was not able to find a simple way to achieve this. I have to use a standard VB form with textboxes for ths text file opearations. s

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Synchronize Datatable And DataView For Read / Write Operations?

May 5, 2010

I have application in .net 2.0 in which I have a DataTable object globally in my application and have different dataviews in whole application.

When an action performed i have create many threads lets say 5 in which data is read from different dataview, meanwhile while 2/3 threads are reading data(not all 2 more left to read data) a thread write data in datatable. So we get exceptions like "Enumeration update" or "parameter not null" type.

I have use ReadWriteLock for this but do not find any luck it gets stop on ReaderWriterLock.AcquireWriterLock().

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Text File Read / Write And Modify Operations

Nov 29, 2010

I am currently working on an application which requires reading, writing and modifying data from a TEXT file. I have searched a lot but was not able to find a simple way to achieve this. I have to use a standard VB form with textboxes for this text file operations.

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Post A Simple Code Using VB That Start Building Simple Games?

Jun 10, 2011

Is there anyone can post a simple code using vb,that start building a simple games ?

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Multi-threading Mechanisms To Run Some Lengthy Operations From Winforms Code And Communication With GUI

Mar 16, 2010

What do I want to achieve: I want to perform some time consuming operations from my MDI winforms application (C# - .NET). An MDI child form may create the thread with the operation, which may take long time (from 0.1 seconds, to even half hour) to complete. In the meantime I want the UI to respond to user actions, including manipulation of data in some other MDI child form. When the operation completes, the thread should notify the MDI child that the calculations are done,so that the MDI child can perform the post-processing.Should I use explicit threading (i.e., create explicit threads), thread pools? Or simply just propose your solution. Should I create foreground or background threads?And how does the thread communicates with the GUI, according the solution you propose?

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Write Simple CAD Software?

Dec 17, 2011

I was just wondering if there are any examples around the internet on how to develop a simple CAD program.

Would I be better off drawing on the form directly or use a Panel or a PictureBox for that?

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How To Write Simple Validation Expressions

Jul 25, 2011

How to write a simple validation expression that will accept any whole number greater than zero but less than 1,000.

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Write A Simple Expression-like Class In .NET 2.0?

Jul 7, 2010

I'm currently working in .NET 2.0 Visual Basic. The current project is an Active Directory Wrapper class library within which I have a Searcher(Of T) generic class that I wish to use to search the underlying directory for objects.


In short, I want to offer some kind of Expression feature to my users, unless it is too much work, as this project is not the most important one and I don't have like 2 years to develop it. I think that the better thing I should do is to write something like CustomExpression that could be passed in parameters to some functions or subs.

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Write A Simple Sine Graph?

Mar 21, 2011

How to write a simple sin graph for my calculator? I need , when I'll press the button, to show this graphic.

Private Sub btnsin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsin.Click
For i = 0 To 100


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Write Simple Program To Run In Vdraft Using It's Api?

Jan 20, 2009

First I'd like to say I am not fluent in Visual Basic, I down loaded Express 2008 and have easily completed the first few lessons. I have some programing exerpience. I have written a few simple programs with Autolisp for Autocad.Vdraft will only integrate with full blown VB programs. So, Maybe someone can write a simple program using Vdraft api which can be found at :

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How To Write Simple Envelope Printing Application

Feb 16, 2011

VS2010 VB.Net Windows Form (not WPF). Any Hello World level example for printing the text within a multi-line text box they can post? Ditto for a print preview? I need to write a simple envelope printing app and I need a good base to build upon.

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Read/write A Simple Text File In Net 2008?

May 9, 2010

I am trying to read/write a simple text file in net 2008 but can't, as yet, get it to work. This is how I use to do it in VB6

MyStr = App.Path & "DataData.txt"
Open MtyStr For Input As #1


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Simple Read/Write App.config Configuration File

Feb 6, 2010

I have a program with various settings, all stored in the app.config file. Often, I have a need to edit the connection string setting. I cannot do so using the My.Settings.myConnectionStringVariable method, as this is read-only. What I would like to do is have a big text box, and simply load the entire app.config file into it. The user could modify whatever they wanted, click save, and the program would save the new edits to the app.config file, and restart the program. I don't have a huge need to only pull out the connection string, as getting the text for the entire config file would suffice. However, if it is easier to pull out just the connection string from the config file, that would work too.

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Write A Simple Game On Which The Player Has To Pursuit Some Figures On The Screen?

Oct 16, 2009

I'm currently trying to write a really simple game on which the player has to pursuit some figures on the screen. Since i'm just writing the prototype version i'm using a Panel wich i redraw 1000 times per second. Now, i want that every level is similar but not the same as past level, so i created a Level Class that contains the game objetcs of Player Class and the Figure Class, wich are the ones that have all the movement subrutines. So, with a Timer, 1000 times per second, i get the input from a joystick, pass it to the player objetc and update the position of the figure object. All this stuff is reported to an internal Panel that every level object has, wich i refresh and then pass it ByVal to the panel that the player actually sees. The problem i have is that after the first level ends, when the second level starts running, i can see the last frame of the fisrt level flashing behind the figures and it makes the game run a bit slower after every level. I tried keeping a copy of the inicial state of exterior panel and use it to clean the one i'm using on the levels but it didn't work...

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Write A Simple Program Which Will Simply Have Buttons To Open Spreadsheets?

Jan 12, 2009

I am trying to write a simple program which will simply have buttons to open spreadsheets, and a search facilities to look for spreadsheets with a title which is an invoice number. I have my basic forms layed out, all a need now is help with the code.

I am using Visual Basic 2008 Express, and just need a line of code for a button to open an application/spreadsheet. Also, is it possible to have a search box open a file automatically?

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Cannot Apply Simple VB Code As Service Code

Mar 6, 2011

I am currently writing a program in Visual Basic 2008 express edition to read and write to tags on an Omron PLC. I am using the DeviceXPlorer OPC Server V4.1.1.1 program to connect to the Omron PLC. I have made two programs, one is a form program which works fine, two is a windows service program where it does not let me connect to the OPC Server. The connection code is identical, the only difference is the windows service code is called by a timer. The timer works fines and jumps into the connection code, but stops at the line


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Write Some Javascript Code In Response.write When SqlDataSource1_Deleted?

May 23, 2012

i have a notification j-query plugin .. i taste it in my page (working 100%)but when i want to use it in a event SqlDataSource1_Deleted with the response.write method it does not work

Protected Sub SqlDataSource1_Deleted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles SqlDataSource1.Deleted
Response.Write("<script type='text/javascript'> showNotification({message: 'This is a


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Undo And Redo Operations Code For Undo Operation

May 5, 2008

i have written code for undo and redo operations code for undo operation


now when i rotate the picture then tries to undo the image then this erorr comes Stack is Empty and program closes.

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Cannot Use Simple Code As Service Code?

Mar 6, 2011

I'm a rookie in Visual Basics 2008 and i am trying to make a program to communicate and read tags from an Omron PLC. I am trying to connect to the PLC via devicexplorer opc server, because it can let me read DInts and Reals from the PLC tags. I have referenced Microsoft ActiveX Datas Objects 2.5 Library and OPC DA Automation Wrapper 2.02. I have made some code which connects to the PLC "in a form", but I cannot use the same code and connect through as a Windows Service program.Here is my code,

Public Sub OpcConnect(ByRef Items() As String, ByVal PLCType As Integer)
Dim j As Integer
Dim TempSvrHandles As Array[code].....

Note: this code is run in a timer on the windows service, it connects properly to the "RSLinx OPC Server", but "Takebishi. Dxp.1" (devicexplorer shortcut) exits the sub routine at MyServer.Connect(PLCServer) ' connect to the opc server.

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Write A Simple Windows Form That Will Make It Easy To Record A Voice Message Before Uploading It To A Remote Web Server?

Oct 2, 2011

I'd like to write a simple Windows form that will make it easy to record a voice message before uploading it to a remote web server and sending the URL to the recipient(s):


Currently, the user has to use Sound Record to record the message, use an FTP client to upload it to a web server, and finally, use an e-mail client to send the URL. I'd like to combine those three features into one.

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Write A Code For Serial Ports Without Sucess But The Code Does Not Throw An Error ?

Feb 20, 2011

what is wrong with my code and I get no feedback from my button click event, i have imported. ( code Below) and i have tied differrent combinations of the code without sucess.maybe add extra to my code for the list to show open Port or closed ports.

Imports System.Management
Imports System.Management.ManagementObjectSearcher
Imports System.Management.ManagementNamedValueCollection[code].....

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Asp.net - Write/code Javascript(mouseover Event) Using C# Methods/ C# Code?

Jan 24, 2011

i am asking that can i use c# language to implement "actions" fired on "click side events" such as mouse over the reason for this stupid question is that i remember some syntax of registering functions for particular events of formview, which are call when the event occurs (yes there ispostback involved" is something like the above possible for client side events using c# or even vb.net

protected void Page_Load(object sender, EventArgs e)
Label3.Text = "this is label three";


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Code For Simple Calculator?

Jul 12, 2009

code for calculator using vb.net

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Write Code To Generate A Random Code For A Textbox?

Oct 27, 2009

I'm trying to write code to generate a random code for a textbox. It has to contain both numbers and alphabets. This is what I have so far

Function HomeIDCode(ByRef random As Random) As Random
Dim strValue As String
Dim strAlpha As String


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Get A Simple Code To Connect .net And MSAccess?

Aug 14, 2009

provide me a simple code to connect .net and MSAccess? also provide me the details of where to find ADODB control.

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Inserting Simple Button Code?

Jun 9, 2010

I'm trying to do the very basic add "hello" to a button. The instructions tell you to click on the button the tutorials say the code that is supposed to show starts with "public class form1" but when I double click the button it seems to open the whole code of the template, not the button. (and no where in the code shows the "private sub button1_click")

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Simple Code Lookup To Get Description

Jun 11, 2011

Simple Code lookup to get Description I have a static list of Street Type Abbreviations and their associated Street Type Descriptions: RD to Road. I have the complete list needed. There are 37 elements in the list - 37 Street Type Abbreviations with their associated Descriptions. The lookup will only happen once. The input lookup field is in a single field: stType. Not trying to get fancy. but what is the best approach? Dictionary, List, two dimensional array, etc. Started with Dictionary but the .Add was getting redundant. Two dimensional array let me initialize the values, but searching an old school loop.

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