Is BindingSource Class Makes Use Of Threading?
Dec 8, 2010
Is BindingSource class makes use of Threading to read and write the values in controls and in objects?I mean how bindingsource know when properties of an object changes and sometimes seems not to know? Does it use a kind of BackGroundWorker running to watch changes on bindings objects? And why does it sometimes read and write properties so many times the same value on the same object's property?I found that it's sometimes easier not to use them since it's hard to know why a control do not update but, on the other hand, dealing with control events can be tedious. And what if i tried to make my own BindingSource Class not inherited from the System.Form.BindingSource
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Feb 12, 2012
here is my script:
Private Sub UpdateThread()
Dim AppDir As String = Application.StartupPath()
My.Computer.Network.DownloadFile(MyUpdate.UpdateFetchURL,
[Code]...
It does perfectly the UpdateThread task, but program just hangs.
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Jul 26, 2011
in the richtextbox(from my class) gotfocus -what I need is the richtextbox.text to also be in a different textbox on the form. the richtextbox(readonly) is from my class that has mousedown and mouseup code and more than one richtextbox (small in size) will be on the form in a container so when user clicks on one I need the richtextbox.text to also be in a regular textbox (not from my class) and not located in container. And I need to read a property I made in my richtextbox class.
[Code]...
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Aug 24, 2009
threading in diffirent class?? I get an example like this
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim NewThread As New Thread(AddressOf Counter3)
[code]....
a thread at example above was written in one class, now how to make a same thing like that with a different class?? and one more thing if you click the button twice then it have two proses.
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Jul 19, 2011
I have this class binded to a DataGridView with a BindingSource, what I'm trying to do is make the _SelectedMethod property a ComboBox in the GridView, and then make the items people are able to select from the ComboBox come from _Dictionary.here is my class which is binded to a DataGridView via a BindingSource.
[Code]...
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Aug 29, 2010
using multi-threading in my application.Basically what i am trying to do from within a form event is initiate a class instance and then run a function of that class (via a thread) that changes certain member values of that class.Those class member values are then used to update values on the main form.Ive created a simple example below but i cant seem to get it to work.The class values are not updating and im struggling to understand how this threading works.
Class FormMain
Private Sub BtnClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles myformbtn.Click()
Dim myFileCounter As New FileCounter()
[code]....
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Feb 19, 2010
Basically I try to get a DataGridView and a BindingSource working inside a class. I define them by:
Dim TempDGV3 As DataGridView = New DataGridView
Dim TestBinding As BindingSource = New BindingSource
When I manually add columns to the DataGridView, it works perfectly, but when I set it's DataSource to a bindingsource from a base class, it doesn't load data and keeps throwing 'object does not exist' errors. The bindingsource mentioned here did, however, work on other DataGridViews that are defined in the base class (and implemented in the form to which the base class belongs)
Same for the BindingSource(not the above mentioned, but the one I try to create inside the class in the beginning of this post). I try to use it in the following way:
TestBinding.DataSource = TempDGV3
TestBinding.Filter = filterString()
SourceDataGridView.DataSource = TestBinding
But the BindingSource keeps returning 'Nothing' for it's datasource and basically doesn't work. However, the SourceDataGridView mentioned here gets filled with 63 columns with "AllowUserToAddRows" and other properties when the columns names are asked.
So my question is: how do I get the BindingSource and the DataGridView to work in this class? I'm getting the feeling I'm missing out on something very obviously here. If that's not the case, I can report back with more code?
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Mar 7, 2011
I want to search particular item in Binding Source for which i use BindingSource.Find() method, but it throws an exception "This operation requires an IBindingList". My binding source is bind to a .net class object.. I searched over the internet, but could not find the clear solution to achieve this task. The sample class code is given below:
Imports System.ComponentModel
Public Class Department
Private _code As Long
[Code].....
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Jan 15, 2010
In frmMain:
Private Sub DBReadAccountInfo(ByVal strAccountID As String)
Dim tmpaccountInfo As New PublicFunctions.clsAccountInfo
tmpAccountInfo.strAccountID = strAccountID
Dim ReadAccountInfo_Thread As New Thread(AddressOf tmpAccountInfo.DBLookupAccount)
ReadAccountInfo_Thread.IsBackground = True
[code]....
In "sub UpdateAccount", frmMain.InvokeRequired is always false. There's a MenuStrip control I'd like to update the .Text on.
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Mar 12, 2011
I have created a class for Socket reads so I can create sockets on command. Due to performing a socket read, the program will freeze waiting for incoming data due to being on a single thread. So I created a separate thread for the reading of the sock and attempt to invoke an event to prevent multi-threading errors.
But I am getting an error when trying to Invoke: "Invoke or BeginInvoke cannot be called on a control until the window handle has been created."
How can I fix this or is there a better way to read a sock without freezing the thread?
Class for Sockets:
Option Explicit On
Option Strict On
Imports System.Text
[CODE]...
Calling form code example:
Private WithEvents Socks As clsSock
Private Sub Sock_Connected(ByVal state As String) Handles Socks.Connected
MsgBox("Connected - " & state)
[CODE]...
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May 15, 2009
I'm attempting to communicate via USB to a hardware device. So far I can use CreateFile, ReadFile and WriteFile to communicate with the device efficiently, but occasionally the WriteFile call will hang because there is no device located at the port where it was installed. I have the WriteFile and ReadFile calls in a managed thread that I use the Join() method on to return control to the parent thread.
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Jun 3, 2009
What is the best way to access a value of a control within a form outside of the form class. I have a lot of functions defined in a module, one of these functions requires a series of values from controls in my main form such as the FolderBrowserDialog.SelectedPath element. I understand that these cannot be accessed in the format form.FolderBrowserDialog1.SelectedPath and that they need to be accessed using a delegate. This is the part I am stuck with.
[Code]...
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Jun 11, 2012
In Visual Basic 6.0 Professional, on some of my programs (probably the simple ones) the File drop-down menu Make option has .vbp instead of .exe extension. How do I force it to compile?
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May 6, 2010
I have a data driven application in <acronym title="Visual Basic">VB</acronym> which works with an SQL Server 05 Database.Since this app makes use of many queries and commands, occasionally i'me getting a timeout error as the connection pool is full. So i figured that at a specifc point in time within the app,i'll clear the connection pools using the ClearAllPools method rather than increase max pool size.
I'm using the performance monitor on my XP development machine (NumberOfPooledConnections) however not once do i see the number of Pooled Connections reset to 0 even when that method is called.How can I determine that my solution is working (if it is) before I deploy the update?
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Jul 11, 2011
When in debug mode This code:[code]I would put out the whole source code but, just the extended browser alone is about 500 lines.
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Mar 30, 2010
I just tried fooling around with a "windows forms" project, and I would like to see the code that creates the form. How would I go about looking at that?I can only edit the code that would occur from GUI events.
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May 29, 2011
I am writing an application in VS2010 using VB.net.The application is relatively simple and I would expect the .exe to be less than 1 Meg.I have written a couple of applications that are quite a bit larger that are less than 2 Meg.I am compiling in "Release" mode.The file size is 29,127 KB (in debug mode it is just 29,167 KB)Where do I start looking to find why the .exe is so large?
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Mar 26, 2011
In a function I have
Do Until PageLoaded() = True
{
Nothing
}
The problem is it freezes up the program and makes it unusable. I fixed it using timers but it makes my program real sloppy and hard to edit.
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Mar 4, 2009
The question header is clear, i want to know why its different and why, when to select it for my project?
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Sep 23, 2011
Calculate the value between 0 & 180 degrees that makes the function sinx=x
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Apr 9, 2012
I have some coding which basically edits my text file and removes the duplicates. For some reason when I run it, it hangs my application for like 10 seconds - the coding does work just hangs my application..[code]
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Jul 27, 2011
i have a problem.. i use this code to download:Dim dl As New System.Net.WebClient dl.DownloadFile({online_file}, {local_file})now, it does download the file. my work is done. the only downside is that, until the download is finished, the program crashes!if i download a 5kb .txt file, all is ok, you wouldnt even notice
if i try to download a 15MB .rar file though.. now the program crashes for a long time! when the file is fully downloaded it works just fine again.how can i make it so that downloading doesnt make the application non-responsive?(and if possible, how can i make it see how many kb is downloaded? like at this second its 15kb of 2048kb)
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Sep 10, 2011
I was wondering if it would be possible to monitor a programs audio output and identify when its on / off? I'm coding a carpc frontend and would like to mute the audio when the navigation program speaks directions.
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Sep 4, 2011
Try
OleDbConn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\list.mdb")
OleDbConn.Open()
[code]......
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Jan 21, 2010
I'm have coded some code so that when Ball1 hits objects extra1 or extra2 or extra3 or extra4 or extra5 then that extra what ever value was hit would disappear. But for some reason when ball1 hits one of them they all seem to go.[code]
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Apr 4, 2009
Another one of my noob questions. How would I assing the enter key to press a certian button? Like I press enter and it presse the go button on my webbrowser.
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Feb 12, 2012
I have a custom NumericUpDownColumn in my DataGridView. Problem is that when I type in a 0 in those cells it automatically changes to DBNull, this causes all sorts of problems with other code. I found the code for the custom column through a google search and don't know enough code to actually go through it and fix the problem myself. If I change the column to a TextBox column instead, it shows a 0 instead of DBNull and everything works as it should. So I figured the problem must be within the code for the custom column. Here's the
[Code]...
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Jun 1, 2010
Is there any way to change the sound MessageBox makes when it appears? I've written a Hangman game that displays a message box when a player wins, loses, hits an invalid key, or presses the same key twice and it always makes the same sound.
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May 23, 2010
[code] When I click on the Button that makes the Prog Bar activate then when its all full it spams the MessageBox saying "Hai" Unlimited times.
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Oct 15, 2010
How do i make a folder that my program makes hidden. I am using (MkDir)
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