How To Sent Data Through LAN

Jan 7, 2010

I want to create a program to sent customer information from one PC to other PC. But i don't know the codes to create this program.

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Dont Get Any Data From Socket When Data Should Be There And No Exeptions Raised, Connection Is Open. Using DataAvailable To Wait For Data

Mar 24, 2011

I have a problem reading data from an RFID-reader. I connect to the reader by tcp and wait for DataAvailable to be true, then reading the data until I got a end of data character. Then I just go back and waiting for a new DataAvailable. This is done in a own thread for the function.

There seems to be some kind of timeout, If I don't got any data in a couple of minutes, then it just sits there in the do/loop waiting for DataAvailable. I hold the card to the RFID reader, it beeps, but there is no data available. I don't get any exeptions, and the information says that the clientsocket is still connected. Are there anything more I can check?

If I put the card to the reader in a minute-interval it seems as this will never occur. So 2-3 minutes idle:ing seems to do this.

Here are my code to read data from the socket, I have taken away some irrelevant code:

Sub test(ByVal ip As String, ByVal port As Integer)
' this sub is meant to run forever


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HSD 32 Bit Data Bus To Serial Converter Via A Microcontroller - Data Sniffer To Read The Data Bus (32Bit)

Sep 3, 2008

Im working on a HSD 32 bit data bus to serial converter via a microcontroller. Now first I want to make a sort of data sniffer to read the data bus (32Bit) .All on the controller side is working and the stream of bytes are coming in via RS232 as 4 bytes in HEX like FD,A5,45,8B . I already converted the bytes in Dec and ASCII to determine what is passed true the bus and how fast and stuff.. Now that is all correct and working very well if the LSB (least significant bit) of the 32 data bus is Data line 0 and the MSB (most significant bit) is Data line 31 but if that is not the case I need to invert the 32Bits (like as I would invert the connector on the bus) . How do I best do this using the 4 bytes I send from the micro controller.


(MSB) 01001000 01100101 01101100 01110000 (LSB)
HEX= 48 65 6C 70
DEC= 72,101,108,112

I need to invert it with a button to:

(MSB) 00001110 00110110 10100110 00010010 (LSB)
HEX= 0E 36 A6 12
DEC= 14,54,166,18
ASCII= (SO) 6 : (DC2)

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GPIB Communication - Sending Data - Receiving Data - Saving Data

Sep 19, 2010

I need to control a device with a GPIB port. I have the commands that I need to use to do this; but I don't know which is the sintaxis in Visual Basic.

For example if I need to send a instruction like "START:0.01" to the external device which are the libraries that I have to include?, how should I write the programming line to do this?

The main tasks that I need to program are sending data, receiving data, and saving data

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Data From Access, Data Adapters & Data Sets?

Apr 19, 2011

I have a basic application that allows pre-defined users to use the application.The Username & passwords along with some other basic user info is stored in a simple access dbIn my application I want a user to login, Username & PasswordI create a connection string, a data adapter and a dataset, I then need to validate the password the user has entered.Would it be best to query the access db directly, or the dataset?

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Update New Data With The Previous Data If The New Data Equal To 0?

Sep 11, 2010

I am having an issue on the listbox when the new data value equal to previous data then = to "0". However, I want if the new data value( A ) is equal to the previous data( B ) then ( A ) equal to ( B ).

Delegate Sub ListBoxUpdater(ByRef listbox As ListBox, ByRef str As Object)
Private Sub OnQuoteUpdate(ByRef QuoteUpdate As LingLib.structQuoteUpdate)
UpdateListBox(lbBox, QuoteUpdate.tQuote)
End Sub


My problem is when the new data comes out from the API, if it is equal to the previous data and it will appear 0. But what i want is the new data comes out is 0 and it will equal to previous data. e.g: first data comes out is 12.00, in above case, if the second data comes out is 12.00 but it will shows 0 which means unchanged. But in my case now, i want if the first data come out is 12.00, then if the next data is unchanged (0) and it will appear 12.00 and so on.

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Update The New Data With The Previous Data If The New Data Equal To &#?

Sep 7, 2010

I am currently working on a API. I am having an issue on the listbox when the new data value equal to previous data then = to "0". However, I want if the new data value( A ) is equal to the previous data( B ) then ( A ) equal to ( B ).

Private Sub UpdateListBox(ByRef listbox As ListBox, ByRef str As Object)
If (listbox.InvokeRequired) Then
Me.BeginInvoke(New ListBoxUpdater(AddressOf UpdateListBox), listbox, str)


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Connect To A Database And Retrive Data Using Oledb Data Provider In Microsoft Access?

May 7, 2009

how to connect to a database and retrive data in a table using oledb data provider in Microsoft access?

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Create A Table That Include Current Year Data And As Well As Previous Data To Be Compare

Dec 8, 2010

i want to create a table that include a current year data and as well as previous data to be compare. here is the example of the table that i want to create: but i want to compare one of the annual data with the previous year. as example i want to compare between the data of current AR of 2007 with the current AR for 2006, Current AR of 2006 with current AR for 2005 and go on~, but i have no idea how to do it.

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Data Table - Datagridview - On Running The Code A Second Time The Related Data Is Lost

Aug 6, 2011

I have two data tables. the second related to the first. Using a datagridview for the first table I am able to enter and save data ok. if I run the code twice in a row the data is still there. When I edit the data in the related table in it's own datagirdview the data is there and displays correctly, but on running the code a second time the related data is lost. In both cellendedit events I am using



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Input Several Boxes Of Data On One Form And Display Individual Pieces Of That Data On Several Other Forms

May 22, 2009

I have just started with vb and would like to know if there is a way to input several boxes of data on one form and display individual pieces of that data on several other forms at timed events in the future?

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Saving Replicated Data - Current Data Saved To Appear In Page Within All The Relevant Fields?

Jun 2, 2010

What I am trying tot achieve is the following:User inputs data in one form that saves to the dataset table no problems. On an edit screen I want the current data saved to appear in this page within all the relevant fields but when saving I want this data to add to the dataset table as an additional line of data so the transaction records are kept.I want to add a new datarow regardless of it saving one change or all 7 changes that are possble.

e.g. Line 1 - user inputs 7 cells of data Line 2 - user amends 2 cells of data Line 3 - user amends 1 cell of data an so on. Unfortunately the terminology for certain items above may not be correct as I am still new to this programming and still on a massive learning curve.At the moment I do not have the code for what I am trying to achieve as I really dont know where to start with it.I am currently able to save the data and have it appear in the "edit" panel however only the cells changed are saved an it overwirtes the initial input.


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Variables - Combining Multiple Data Types Into A Single Unified Data Structure

Mar 16, 2012

In VB.NET I would like to create a complicated data structure with multiple types of data stored in an array like format (see below). I am trying to create a data structure that would look something like this: [Name; xLoc; yLoc; zLoc; [Jagged Array]] Note: Name needs to be dimensioned as a string, xLoc and so forth as integers. The Jagged Array would look like this:


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VB - Simply Link A Data Grid View To Display Data That Was Selected From A ComboBox?

Oct 14, 2010

I just want to display data in a DataGridView (from SQL - already made the connection) based on what is selected in a ComboBox (data that is also coming from SQL). The 2 are separete on the form. I am using VB 2010.

This doesn't work for me:
objCommand2.CommandText = "SELECT ProductID, Name, Color, Size, ListPrice FROM SalesLT.Product WHERE ProductCategoryID = " & cbCategory.SelectedValue


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VB 2003 - Handling Data - Transmitting Data From A Comm Device Via Serial Port

Nov 10, 2009

I'm currently working on a project where I am transmitting data from a comm device via the serial port and resorting the raw data (in binary) to its respective ascii values. The problem I'm facing is determining the most efficient method to accomplish my goal. Essentially, I have 68 bytes coming in, the first and second bytes represent the page and packet number and the data itself ranges from 3 to 64, the remaining for my checksum.

What I am needing to do is, grab 50 consecutive bytes per variable in my array, and that is where I'm confused. I have easily pulled my 3-64 bytes and stored that data to a string. I just don't know the most efficient method to accomplish my goal. Should I write directly to file all my data, as there are like 8 pages, of 128 packet data. [Code] I can capture the the first 50 by using a for-loop easily, but what would be the preferred method to track what data chunk I've taken? The more I think about it, I think I may just want to write to file, all my data, and then just take them back to back in 50 byte chunks. Is that the most efficient method?

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VS 2010 Conversion Failed When Converting The Varchar Value 'System.Data.DataRowView' To Data

Jul 15, 2011

Im getting that error in the da.Fill(ds)

Imports System.IO Imports System.Data.SqlClient


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Write Code For Application, In Which Data Is Get By User And Entered Data Is To Print In A Particular Format?

Mar 2, 2012

i just write code for application, in which data is get by user and entered data is to print in a particular format?give me a code for button by which after click on it will print entered data?

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C# - Modifying Data With ListView EditItemTemplate By Settings Its Data Source Property

Feb 22, 2011

Modifying data with the ListView's EditItemTemplate by programmatically settings its DataSource property and calling its DataBind method. I don't have option to use data source control for ListView. All ListViews are bound with data from code-behind. So, I have to handle the Edit/Update mode of ListView manually. [Code]

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Code That Reads An Input File And Store Data In SQL Server Data?

Sep 11, 2009

I am new to I want to read and input file and store that data to an SQL Server database. Do you have an sample code that do such?

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Combobox Displays System.Data.DataRowView When Trying To Select The Data From Sql Database

Jun 30, 2011

I got the System.Data.DataRowView when I tried to select the data from sql database. These are my code:

myCommand = New SqlCommand("SELECT FirstName +' '+ LastName FROM tblVisitor", myConnection)
myAdapter = New SqlDataAdapter(myCommand)


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Connect A VB Application To An MS Access DB By Adding A Data Source From The Data Menu?

Jul 7, 2011

I'm trying to connect a VB application (2010) to an MS Access DB by adding a data source from the data menu but I receive this error message "The connection you selected uses a local data file that is not in the current project.Would you like to copy the file to your project and modify the connection ?

If you copy the data file to your project, it will be copied to the project's output directory each time you run the application" and the options are (yes , No , Help)

If I choose Yes I will not be able to make the application 'device independent ' since it will not be copied under the bin , and if I choose No , changes won't be applied to the DB

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Continously Reading Data From A Modbus TCP Device And Store Data In A Textfile?

Mar 2, 2012

I have a modbus TCP device that I have managed to connected to through my VB source code.

I want to poll (continueously read) data from certain registers of the device, and store the polled data in a file (text,csv, excel).

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Create A Graph Where The User Can Input Data Into Textboxes And Then Plot The Data?

Jun 15, 2009

I'm just trying to create a graph where the user can input data into textboxes and then plot the data. I am attempting to use Zedgraph, but open to other suggestions. The program below creates a plot, but it won't update when the textboxes are updated.

Imports ZedGraph
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load


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Data Bound To ListBox - Display Two Data Items As A Single Item?

May 7, 2012

I have an Address Book project with a listbox. The listbox is bound to the database via the little arrow pop-up box in the corner of the listbox. I have the DisplayMember set to FirstName, and obviously only display the First Name of the contact in the ListBox. Is there an easy way to change it so that it displays the First and Last names? I can't change the binding because I need it to get the ID of the record selected.Here's the basis of my code...

Private Sub MainForm_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'CompanyDataSet.Contacts' table. You can move,


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Data Logging Application That Stores Data In A Table In A MySQL Database?

Dec 18, 2010

I have a data logging application that stores data in a table in a MySQL database. Data with a TimeStamp is logged into the table anytime the data from the sensor changes. This means that there maybe 2 seconds between data points or there maybe 20 seconds between points depending on how the data is changing.

When I need the data I have 2 dates and use this command to fill a table..SELECT FROM myTable WHERE timeStamp > date1 AND timeStamp < date2 This gets all the data that has a TimeStamp between the given dates, but in most case the first date in the returned table will be after date1, so I need to get the data from one row before the date returned in the table to know what the data was at date1.How can I get the data row that immediately precedes the returned data set?

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How Is WPF Data Binding Using Object Data Source In Visual Studio 2010 Done

Apr 23, 2010

how to use the VS 2010 IDE tools in a way the Microsofties didn't specifically intend. But since this is something I immediately tried without success.

I have defined a .NET 4.0 WPF Application project with a simple class that looks like this:

Public Class Class1
Public Property One As String = "OneString"
Public Property Two As String = "TwoString"


The expected result was that "OneString" would appear next to "One" and "TwoString" next to "Two" in the running window.

The question is: Why didn't this work? What will work instead? If I put bindings in a DataTemplate, it works. Blend, with its sample data stuff, implied that this should work, but it doesn't.

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How To Create A Simple Report From Data Collected From A Data Entry Form

Oct 13, 2010

Currently we are using a VB script macro created in word to create some fairly simple forms based off of data entered on a data entry form. I am very new to VB, and I have been able to create many applications using forms, but I have absolutely no history creating reports. I have been reading up on the reports, and it looks like they are designed to use with data sources like tables. I merely want to take either data from the entry form, or from data derived internaly from processing the user entered data and populate a defined report "form". I have been searching, but there is so much on printing reports, that I feel overwhelmed. I am not looking for the exact answer as much as a link or place to look for a sample for what I want to do.

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Office Automation :: Populate Access Data Table To Data Grid?

Nov 11, 2010

The control comes up blank??Imports System.Data Imports System.Data.OleDb Public Class Form1


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Saving Data From A Data Grid To An Access Database (2008 Express)?

May 18, 2010

I'm trying to create a simple Data Grid that will automatically save changes. So far I have a data grid connected to a MS Access 2007 Database that reads the data. I can create new fields in the Data Grid, but I need to program to save the data automatically to the database on update (or on close).

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VB 2008 Check For Data And Make The Program Stay There Until The Data Is Input?

Aug 3, 2010

I have a program for school project that has input fields for Name, Address, City, State and Zip. I need to error check so that the fields are not empty.I have used If statements that check to see if the fields are empty and shows a message box if they are but if I leave the whole form empty and click the button that activates it, all the if statements go- one by one instead of pausing for the user to input the required data.How do I check for data and make the program stay there until the data is input? I have tried TRY/CATCH but it won't catch this type of error.

this is the

'This program computes customer's bills at the pizza shop for all combinations of
'crusts, toppings, sizes and discounts
Option Strict On
Public Class PizzaForm


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VS 2008 Select From Excel Returning Null Data Instead Of Real Data?

Dec 22, 2010

I typed this question once already, hit preview, and somehow never got the preview and lost what I typed. It has been that kind of a day.So here is my quick overview then I am going shopping. I am using OLE DB to select from an excel spreadsheet. It has over 15000 rows and 33 columns. Sometimes even when a cell is not null, it is returning a null value. If I just do a "select * where [termination date] is not null", for example, it will return no rows even though I can see with my own eyes that sometimes termination date is not null.

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