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help....
I have a reporting aspect to my online application and I'm trying to set it up so that I make an asychronous call to a GetData type subroutine, and paste the data returned by this into a datagridview. Ive defined a report class which goes off getting tabulated data, which I have also defined in a class, and it works when i call the routine and wait for a return, but using asynchronous methods I keep getting the message that i cannot parent a control to a thread it was not created on...
i don't understand why this is. The data class is not a control, my datagrid is on the calling thread, but when I try to paste data into it from another thread it seems to cause problems. Am I barking up the wrong tree completely? Is there a workaround for this or will i have to stick to a crappy, non-responsive UI while the report runs?
Really sweating this. Rolling out in a couple of days, and it needs to be good!!!
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If you use the BackgroundWorker class, you can pass data back to the main thread.
But, how will it be more responsive ? If it's a web page, it's waiting for a refresh anyhow, right ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Sorry mate, misuse of the word Online there. I come from a mainframe background, and I still use some of thse legacy terms, e.g. Online as opposed to batch processing.
The problem I have is that, well, since yesterday when I posted I've managed to get the control updating to the screen, but it becomes unresponsive, when i click it the entire app just hangs, in Task manager, it waits for about 5 secs then generates another process sing the applicatin's title, but running EXPLORER.EXE. All of this suggests to me that I'm screwing with something fundamental. I may roll back to an earlier version which didn't (try to) implement multithreading....
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I created a Windows Controls Library project so that I could create my own modified version of a combobox. When I began the new project VB starts you out with a region to put your controls in. I drop a combobox in there and resized the region to be the same size as the combobox. When I tried using it in a new Windows project the right side of the combo is cut off. If I make that region a little bigger it shows up as being part of the combobox. Can you make this region invisible or keep it from interfering?
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Try using the DockStyle property of the combobox control. You can either set it in the properties window of your custom control or do it in code (e.g. Combobox1.DockStyle = DockStyle.Top)
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Thanks. That worked. But also, while in the designer, if I click on the combobox I frequently cause VB to abnormally shut down. Why does this happen?
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I'm not sure, it could be a bug in your copy of VS or perhaps your machine is screwing up somehow, or it may even be (tho I doubt it) your code.
Quite honestly, I have no idea.
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Something else to consider: if you're only using a single combo box for your control, you should look into inheriting the Windows.Forms.ComboBox. This will solve your display issues. You can get started very easily by pasting this class declaration into a new Class file, overwriting the default text:
Public Class MyCustomCombo<br />
Inherits System.Windows.Forms.ComboBox<br />
<br />
End Class
Mind you, programming an inherited control can be tricky, but the rewards are worth it.
james
commercial developer, author, speaker, dude.
www.jamesfoxall.com
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You read my mind  but I was thinking it might be a bit too tricky for him considering he's still getting to grips with custom control authoring.
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I agree, but I wanted to throw it out there. It's certainly worth spending a half hour with google over.
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How can i get a number incremented ech time i click a button n that number should be displayed in a label.
The number should start from 1 daily and should be incremented when that button is clicked and next day it should again start from 1.
Kindly Help Me
With regards
Withe Regards
Alok Singh
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Save the number with the date where your app can access it (textfile, registry, app.config, etc.), convert it to integer and then add 1 to it. When the app starts it compares the date and value from the stored value & increments.
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Hi to all, I am Jayachandra,
I am learning VB 6. Now my problem is Data Reports. I am getting the report on the basis of user request for the first time only. But when i try for another record I am getting an error message like...
Msgbox "Operation can't process as the object is already open". Please solve this problem. Here I am using Access as backend. IN Dataenvironment i have selected SQL Statement in properties of the command. I have written the sql statement as-- select * from tablename where columnname=?
Please help me anybody I would be thankful to you.
Jayachandra
-- modified at 9:01 Tuesday 10th October, 2006
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Hi
I am working on a 'SCHDULER APPLN' in VB. Net. Appln itself has a scheduler.
I want to share these schedule to Outlook using Google Calendar feature.
If any body knows how to implement these pls help me. Any help will be appreciated.
I refer this link http:://code.google.com/apis/gdata/calendar.html. I couldn't do more.
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hi
i am devloping a report. I need to create a report (Crystal reports) to generate the report. the problem i am facing is that i am not able to print reports. What is the solution to this......
But report is opening n i can see that.
I want to know how can i print it directly??
Kindly help me
Withe Regards
Alok Singh
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Dear all,
We have a system wherein an output file is generated by some other program other than .Net.The output file is a textfile.Now we have to upload this textfile into the client's server through ftp(or whichever way its possible)using vb.net.
Can u please suggest me some code on this.PLEASE..deadline's just ahead.
thanks in advance,
Preethi.
preethishivbaba
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Hi,
You can actually create a windows service with filesystemwatcher, which keeps watching the creation of any new text files.
The code within the windows service looks something similar to the below:
Protected Overrides Sub OnStart(ByVal args() As String)
InitializeEventLog()
InitializeFileWatcher()
InitializeMailServer()
End Sub
In the InitializeFileWatcher, specify the ftp folder path and add an event handler,
Private Sub InitializeFileWatcher()
fsWatcher = New FileSystemWatcher
fsWatcher.Path = "\\FTP\Folder\*.txt"
fsWatcher.NotifyFilter = (NotifyFilters.DirectoryName Or NotifyFilters.FileName)
fsWatcher.IncludeSubdirectories = True
'watcher.NotifyFilter = NotifyFilters.FileName
'watcher.NotifyFilter = NotifyFilters.DirectoryName
' Only watch text files.
fsWatcher.Filter = "*.txt"
' Add event handlers.
AddHandler fsWatcher.Created, AddressOf OnTextFileCreated
' Begin watching.
fsWatcher.EnableRaisingEvents = True
End Sub
so, in the OnTextFileCreated sub procedure, load the data from text file to the local server
Private Sub OnTextFileCreated(ByVal source As Object, ByVal e As FileSystemEventArgs)
'Code for loading text data to local server-database
End Sub
So, whenever there are new text files created in the specified FTP folder, the event is raised and the text file data is loaded to the server.
Vidya
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Vidya,
thanks a lot.I am gonna try this and get back to you.
Preethi.
preethishivbaba
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i want to know how to connect tk solver with vb and access the same with vb code........
can anyone help me on this...........its really urgent
-- modified at 6:53 Monday 9th October, 2006
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hi
i want to copy data of one table to another table
and get backup from database
my database is access
i dont find any sample about it
please help me
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Do you want to copy data to another table inside the existing database or back it up to a separate database? Are you simply going to append the data to a table whose structure has been defined in a prebuilt database or do you need to create the database and it's tables from scratch?
More info needed before we can help.
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hi
i want to copy first:
data from table to another table inside the existing database and then back database up to another place
i want to append the data to a table whose structure has been defined in a prebuilt database.
please help me
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Hi,
I Have a window 2003 server machine. I Installed visual studio.NET 2003 on my machine.
In Microsoft visual studio .NET 2003 a error is occured ,
when I want to create a new project in ASP.NET Web
Application visual studio .net has dected that the web
server is runing ASP.NET version 1.0.
The web application you are creating or opening can be
configured to be complaint with ASP.NET 1.0 .
however , the application will not able to use new
features from ASP.NET 1.1 .
So I can't work on my machine for Dot Net .
Plz sugess me for this .
Thanks all off u .
nilesh
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Nilesh
Have you installed 1.1. of the framework on the Server? Or am I miss reading and the server and deveopment machine are the same box?
Cheers
tom
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Can somebody help me to get the code for how to import excel sheets to MS SQLServer through VB Programming and how does it identify the row and columns of the excel sheets in the database.
need help urgently
Neha
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