VS 2010 Back Ground Worker Statment?
Mar 9, 2010which statment is right and why
vb
Private Sub BackgroundWorker1_DoWork(sender As System.Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
[code].....
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Connection String And Back Ground Worker
Dec 3, 2008I have an application that monitors a set of opc boolean tags.When a tag changes from false to true (triggered), the application is supposed to query the database for data recording during a specific time period.I had the app done or so i thought until i realized that the background worker that i dimension to do the query is not firing the runworker completed event.at the start of the app, I create a new class for each trigger config in an xml file. Each trigger class has its own opc monitor and handle specific for that one boolean tag.If a tag changes to true a NEW instance of the query class is created.A new background worker instance is dimensioned to do the actual work.(this because there is a pre trigger query and a post trigger query which could be up to 24 hrs after the event has been "triggered" to true and the bg worker will wait until the required amount of time has completed before doing the post query).When the bg worker has completed, it should dispose of itself and all its managed resources.
The very first tag that changes to true will function as expected but when it is complete the RunWorkerCompleted will not fire. Everyone there after will operate as expected but not the very first one.I couldnt figure out why so I started commenting out some code.If I remove the line to create a new oracle connection, it works. [code]
Back Ground Music In Express Edition
Dec 19, 2010i need some codes to play a mp3 song somewhere on the form, i don't know the control for this and i'm a noob, please help! Another thing is whats the difference between express edition and non-express edition ?
View 5 RepliesProgram Slow Down When I Add A Back Ground Image
Jan 15, 2010Why does my program slow down when i add a Back Ground Image?
View 12 RepliesVS 2010 Exception With SQL Statment In Vb (asp.net)?
Dec 6, 2011I have this SQL Statement:
de.SqlStatement = "SELECT A.Name, A.Catagory , COUNT(Patient_ID) AS PNO FROM PatientApplyToAssociation P INNER JOIN Association A on A.Association_ID = P.Association_ID WHERE A.Catagory='" & "health" & " '" & "' GROUP BY A.Name '"
[Code]...
VS 2010 If Statment Not Working
Dec 11, 2011[code]why this code dosnt work? the if statment dont excute it work only if it's like this [code]
View 1 RepliesWPF Background Worker Not Recognizing Worker Object
Mar 11, 2009I have the following code that adds a background worker into a VB.net WPF project:
Imports System
Imports System.ComponentModel
Imports System.ComponentModel.BackgroundWorker
[Code].....
And I get the following error for the DoWork worker event:
Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
It seems like it's missing something in the Event declaration, but can't find it.
VS 2010 Using A Background Worker?
Nov 10, 2011I want to use a background worker control in my application, and have it report progress to a Progress Bar It will download data and stuff, and I want to be able to change the text on a label.
View 2 RepliesVS 2010 - Want Background Worker To Use File Copy?
Aug 17, 2011i want background worker to use file copy, how?
View 1 RepliesVS 2010 Accessing Webbrowser From Background Worker?
Feb 19, 2012I have some code that gets the documenttext of the current page in the browser, the trouble is that im trying to use it in a backgroundworker so the ui remains responsive. Everything works fine as is If I run from a button click event, but in the background worker I get errors when trying to use the webbrowser.
'if urltocheck is blank use hidden webbrowser to get page text
If urltocheck = vbNullString Then
'make sure browser isnt already loading
[Code]...
Thats the code how do I make these calls the the browser from the backgroundworker? Or how I can I run an enormous for loop from the ui thread, and still keep the ui responsive?
VS 2010 Datagridview/Background Worker (ByVal)?
Jun 19, 2012It's always been my understanding that ByVal means is that you are passing a copy of a variable to your Subroutine. You can make changes to the copy and the original will not be altered.So if that's true I have two questions- How is my DataGridView updating without me passing the arguments back to it- The backgroundworker works fine as long as I don't reorgnize the columns in the datagrid.
'I pass the rows of my datagridview to the background worker
bgwGetHostStatus.RunWorkerAsync(dgvMonitoredSites.Rows.Cast(Of DataGridViewRow).ToArray)
'It grabs a website name from the IP column and reports if it's down or not in the status column. Now if
[code].....
VS 2010 Standard Thread Vs Background Worker?
Apr 25, 2012I have a application which processes 1000's datas.. for each processing it needs to update gui and db and many variables in my application. So what i have planned is to use 50~90 background worker with my own algorithm of thread pool, synchronization and thread close.So here is it efficient in terms of memory and performance. just confused what to use.. backgroundworker componenet or standard thread.
View 11 RepliesDevelop Ground Control System Software?
Jan 30, 2012I have been assigned to develop ground control system software. The thing is, i have never use visual basic before. Can anyone help me or guide me on how to develop the ground control system software?? is there any tutorials or basic training module which is almost same like ground control system??
View 6 RepliesVS 2010 Adding Child Nodes In Background Worker?
Aug 25, 2011I i'm attempting to add child nodes to a treeview inside a background worker's doWork() method.
I'm getting an exception because I'm in a different thread, and need to use the invoke() method.
Can anyone point me in the right direction?
VS 2010 Cross-thread Operation Not Valid In Worker?
May 27, 2012I'm getting a Cross-thread operation not valid error when my label text changes - this is very strange because it was working up until yesterday.The only way I can get this to work is by applying the invoke..[code]Is there a more simpler solution or will I have to invoke all my label coding?
View 9 RepliesInterface And Graphics :: Label And Ground Box Bacground Color
Apr 7, 2009Im have a picture on my program and a groupbox around 2 radiobuttoms, and 4 labels on the main page.
But all the places i have placed thoes thing the piscture is hidden behind. and i know i can chance
the color but my picture is not a one colored picture:
FedEx Print Ground Shipping Label W/ Tracking Number
May 3, 2011I have no problem printing an Express shipping label.The ground shipping label doesn't want to put the tracking number in the label.Has anyone had a similar problem? [code]When it goes to print the label with all the data it doesn't put in the tracking number, instead it puts in this.[code]how to change this using some fedex webservice call.It does it automatically for express, just not for ground.
View 2 RepliesVS 2010 Background Worker Cross Thread Operation On Active MDI Child
Dec 11, 2011how to put this on a background worker without getting cross thread errors??? trying to upload a childform object values to an access db.I don't work in IT,Our company's LAN so slow that it takes around 3~5 seconds trying to update/insert values in access using the code below so putting it on a background worker i think makes the app immediately usable once save/upload's called unless otherwise somebody could suggest a faster way to speed things up.[code]
View 2 RepliesVS 2010 WPF Threadding + Worker Threads + Updating Progress Bar / Text Area?
Jun 29, 2011I guess that I should preface this by saying that I am totally new to VB, but I come from the PHP/MySQL world so I can work my way through things syntactically. That being said, I have made a program that expedites a few things that I do on a routine basis at my place of work. However, because I have no idea what I'm really doing, my app logs up while the UI thread does all the background work.
What I am trying to accomplish, is a few things. Have multiple functions/subs [done]Somehow generate a generic method that executes a sub when called (one at a time, always)My already coded subs return values (for updating a progress bar for example) but have the background thread that spawns the function, update my UI threads progress bar / list box with the output.I guess I want to know if this is even doable, and secondarily, how would I go about doing this? I understand the idea of threading, but all of the tutorials that I have seen / read are pretty convoluted.
Exit For Each Statment ?
Nov 20, 2011How can i exit a for each statement i mean say i had the code below (not real code its sudo code)
CODE:
but i don't want to exit just this for loop i want to exit the previous for loop at line 1
CODE:
DB/Reporting :: Error On Next No For - For My Next Statment
Sep 26, 2008I am getting an error saying that I don't have for For, for my Next statment. It looks like it doesn't even finnish the initial compile. What is going on?
Code:...................
For Next Statment For Salary Survey?
Mar 28, 2011A company pays its salespeople on a commission basis. The salespeople receive $200 per week, plus 9% of their gross sales for that week. For example, a salesperson who grosses $5000 in sales in a week receives $200 plus 9% of $5000, or a total of $650. Develop a console program (using a one-dimensional array of counters) that determines how many of the salespeople earned salaries in each of the following ranges (assume that each salesperson?s salary is truncated to an integer amount):
a)$200-$299
$300-$399
c)$400-$499
[code]....
My gross salary formula works fine but im confused about my For Next Statement. Not sure if im doing it right. i forgot one thing.... i'm not sure if my increment counter should be where i put it. I think it needs to be in my for next statement?
If Statment - Scroll A Datagridview
Oct 25, 2010I am trying to scroll a datagridview for that i created a scroll event scroll event should have 3 conditions:
1. if I = last row then do not continue adding one to the row index
2. if I < last row then continue adding one to the row index
3 if I = first row do not subtract one from row index
This is the code i wrote for the first 2 conditions, and my system keeps crashes
HTML
If i < grdAccountTypes.Rows.Count Then
i = grdAccountTypes.CurrentRow.Index + 1
Else
[CODE]...
Select Statment Using A Variable?
Apr 8, 2011I am having an issue with the following code. It works when the data is all numeric such as 9200000 but not when the data is alpah numeric such as b101462 I am collecting data from a textbox into a string variable findacct and then using the variable in the sql statement. The data in the access database is char type.
The following select statement works when all the data is numeric for the find acct varialbe but if start with a alpha char like B101462 it gives me a missing parameter error."Select * From purchase where issuedate >= " & "#" & finddate & "#" & "and account like " & findacct)The following statement works when I actually put the account info in the select statement and do not use a variable."Select * From purchase where issuedate >= " & "#" & finddate & "#" & "and account like 'b101462'")
Sql - Returned ID From SELECT Statment?
May 21, 2011I use in my Project the IfExistsTable function; in order to see the existence of a table.
For this purpose I use the Select statement as follows.
MASQLComm = New SqlCommand("SELECT COUNT(*) AS [RecCount] From sys.tables WHERE name Like '%" & tName & "%'", SQLConn)
RecCount = CInt(MASQLComm.ExecuteScalar)
After that I take the number which returned in RecCount. Until now the numbers was 1 and 0
And so I was turn the numbers in True or False.Now suddenly the returned number is 2 which I can't understand what it means.
Extract All Fields From Create Sql Statment Using .Net?
Jul 8, 2009I am creating a windows application using VB.Net and this application will take a SQl create .sql file as a parameter and will return all fields and their data types inside in a list or array.
Example:
USE [MyDB] GO /****** Object: Table [dbo].[User] Script Date: 07/07/2009 10:16:48 ******/
SET
ANSI_NULLS ON GO
[code]....
Should Return:
UserId int, FirstName string, MiddleName string
I want to do this by any way, pure vb.net code or using RegEx.
Make Account Statment Report?
Jun 22, 2010I m tryng to make report but its not working.i explain u to description of my project
i have 5 tables in form Payment,Receivable,Expense,Sale,Purchase and now i want to make debit credit form and its work that when i give a party name the report show me its statment
if the party is vendor show purchse from him and payment paid to him and if he is buyer so show him payment received and sale to him
Single Quote In Select Statment
Mar 10, 2009I have a filter expression that contains a single quote (Al ' ABC), and i am using the Select statment of the datatable where i want to select all rows containing the filter expression, but i am encountering an error. how can i resolve it?
View 1 RepliesSingle Quote In Select Statment?
Mar 19, 2011I have a filter expression that contains a single quote (Al ' ABC), and i am using the Select statment of the datatable where i want to select all rows containing the filter expression, but i am encountering an error. how can i resolve it
View 3 RepliesWrite Sql Statment To Show All rows?
Jan 10, 2012I have two table the 1st std table (stdid,stdname,etc...) 2nd table (stdid,sdate,stdcase)the 1st table for student data 2nd for attendance my program read two table and show them to user in datagridviewdatagridview will show stdid stdname stdcasei want to write sql statment to show all rows from std table and show only rows from 2nd table there sdate = todaydate
View 8 Replies