VS 2005 Exception Freezing Program
Jul 27, 2009
I have a form with binding sources and a method for saving the data.[code]I was testing to see what would happen if the operator tried entering duplicate data in the primary key field. They exception occurred as I expected but the program gets stuck at that point. The exception messagebox just keep redisplaying when you click OK. I'm fairly new to .Net, but this code is how the help files show updating a TableAdapter using the "Try/Catch".
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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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Aug 11, 2011
I've been trying to figure out what is going on with this code, but it looks like I need some help. The issues I'm having is when I click a button that executes my background worker, it freezes and the UI comes back once the listview control is populated.My guess is that some part of my code under the backgroundworker_dowork function is trying to update something on the UI thread causing it to freeze. I just can't figure out what is trying to call the UI.
The user is supposed to click a add server button and enter the server name. The server name will be added to the ListView control. When they click refresh, the background worker is executed which attempts to get the DNS name, IP Addresses, and online/offline status.
Obviously, I'd like to run this code without freezing the UI. Does anyone have any idea on why this might be happening? My guess is because the ListViewItems are passed to the background worker and still have a reference to the control running on the UI thread. Am I right with this statement? If so, how do I change my code to get rid of that reference?
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May 20, 2011
My program keeps freezing. Here is my [code]...
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Oct 8, 2010
how do I delay my program without freezing? I am sure there is another way to do this without timer.PHP uses sleep(). What do VB use?I tried some Delay or Sleep function but don't seem to work..
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Feb 24, 2011
So I have a bookmark function setup, and this is another functions that loads the appropriate website icon to the listview option that it goes with.
Public Sub getBookPic()
On Error Resume Next
Form2.ImageList1.Images.Clear()
[code].....
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Mar 9, 2011
My program becomes unresponsive when I download Data using WebClient.OpenRead(). What can I do to prevent the program from freezing while downloading the Data?
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Sep 16, 2009
i am trying to read website content and selecting some sites from list which contains keyword.But my program is freezing while sending webrequest and getting webresponse.Here is my code:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim j As Integer = 0
Dim stream As System.IO.Stream[code]......
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Aug 16, 2009
im looking for a way to have my program wait a certain amount of seconds before it goes on to the next command, ive tried the sleep command but that freezes up my program and i cannot let that happen, ive heard of using timers as a delay but i don't really know how to do that.
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Apr 18, 2010
I would like to make my program do nothing for a few milliseconds.
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Sep 15, 2011
I have just made a program were i enter a proxy list then my software views a url over and over using the proxys . I was using a web browser in side the program but worked out slow.So i now have changed the code to htpp request. But now when i run the program it goes up by 2 the views then frezzes .Here is my code
rivate Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
If ListBox1.Items.Count = 1 Then
[code].....
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Oct 31, 2009
Is there another way to get your program to "Sleep", without freezing it?
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May 8, 2009
It is possible to catch an exception and throw a new exception which wraps the first exception as an inner exception: [URL] Also, if I call a function and it throws a certain error, but I catch it, will the calling code's catch handler execute? If so, and it is of a higher exception type, is this not wrapping the exception? eg I can throw exception ex of type IndexOutOfRange, log it but rethrow, catch a higher up exception and do something, or I can throw a new exception and wrap an inner exception like:
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Dec 23, 2009
I am getting an exception when trying to run the below code in vb.net 2005
Public Class Form1
Public Declare Function SendMessage Lib "user32" _
Alias "SendMessageA" (ByVal hWnd As Long, _
[code]....
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Apr 22, 2012
I am developing an application with "Visual Studio 2008" (in language VB.NET, Framework: 3.5) with data server as "SQL SERVER EXPRESS 2005".
i have one table with name [fyr] and it contains two columns 'fyid' (integer) and 'fyear' (nvarchar(50)).following queries are showing exception as "No data exists for row/column"
Dim cmd As New OleDbCommand("SELECT * FROM fyr WHERE fyear= '" & DateTime.Now.ToString("yy") & "-" & DateTime.Now.ToString("yy") + 1 & "'", Connection.Instance)
Dim cmd As New OleDbCommand("select * from fyr where fyear = '12-13'", Connection.Instance)
Dim bdr As OleDbDataReader = cmd.ExecuteReader()
both queries above has same result.but all these queries are working if executed directly in "SQL SERVER Management Studio" and showing the expected results.and connection is in open state all other queries in the project are executing correctly and successfully.The table has the data like this:
fyid fyear
1 11-12
7 12-13
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Jan 7, 2010
i did this little bit of Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]...
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Dec 13, 2010
I keep getting the error message "Index out of range exception" when I run the following code.
XX
GN3 = (Loops * 5)
For a = 1 To Loops
For b = 1 To GN3
R1 = Seeds1(Counter1)
Randomize()
R2 = CInt(Int((56 * Rnd(R1)) + 1))
Counter1 += 1
MessageBox.Show(R1 & " " & Counter1 & " " & b & " " & GN3)
Next b
Next a
The message box conforms that the last entry in the array has been reached. And that Counter1 and b both start at 1 and go to 2845. And that GN3 is also 2845 all of the time.
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Jul 31, 2009
I am trying to learn .NET This is what I found on MSDN. I can create an exception class by using this code.
PHP 'Exception Class Code
Imports System
<Serializable()> _
Public Class copyException
[Code]...
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May 16, 2009
I am using a background worker to process some login information. However, the background worker has to stop and wait for 2 events to happen. Once these have finished the background worker can complete its job. They are callback that will call the Set() method of the AutoResetEvent.
So I am using AutoResetEvent to set when these 2 events have finished. However, I seemed to be getting this error message
"Exception has been thrown by the target of an invocation." and Inner exception
"Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index". The exception usually fires when the registration success leaves scope.
The code for the background worker.
' Waiting for 'Account in use' and 'Register success or failure'
Private loginWaitEvents() As AutoResetEvent = { New AutoResetEvent(False), New AutoResetEvent(False) }
[Code].....
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Jan 20, 2010
Imports Excel = Microsoft.Office.Interop.Excel
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code].....
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Oct 19, 2009
I am trying to retrieve an image from a table in sql 2005 server. The field is set to image. I am trying to put the image strait into a picture box.
Here is my code I am using:
Dim strSQL As String = Nothing
strSQL = "select top 1 i.image_data" & _
" from " & mdlMainLib.GetNGConfigInfo(False, False, True) & ".dbo.person as p" & _
" inner join " & mdlMainLib.GetNGConfigInfo(False, False, True) & ".dbo.images as i on p.image_id = i.image_id" & _
" where person_id = '" & sPersonID & "'"
[Code] .....
On the line ME.pb1.image = image.fromstream(stream) I keep getting a "ArgumentException was unhandled, Parameter is not valid." And that all I get to go on.
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Jul 21, 2010
I am trying to add exception information into a textbox and not able to successfully. I am getting an error when trying to do so.
Screen shot of code and error attached. Any ideas how I can accomplish this task?
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Jul 24, 2009
I have most of the obvious user error handled with code, limits to mubers on keypress, if statement in case of input blank left blank etc.. I realize though that are infinintepossibliltys the user can perform especially with the programI am trying to create it requires ALOT of user interaction, with users inputting information (numbers in textboxes) and calculations happen on the fly, in other words there is no Calculate button after everything is input
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Aug 14, 2011
i am using visual studio 2005 and sql 2005 currently i am doing a system registration for staff using windows form,in the system new staff must register they detail, once user type his detail than this error is come out here i attach the picture and coding. I also highlight where is probleam come out for your info my database name is databse name is = login, table name is staff. using will put their detail in text such i write below after doing that i try to click button registe and suddenly this error come out.[code]
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Jun 23, 2009
Catch exception handing in .Net easy could it be to add an Ignore, Retry, Cancel when an exception is caught? Or how do we implement something like it?
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Apr 1, 2009
I have a form with a button that brings up a different form. In some versions of this program (don't ask), the second form is shown non-modally, but in my version it is shown modally. The point of that last statement is that the second form can be either modal or non-modal, so an answer needs to handle either one, but the modal option is more valuable.If form 2 throws an exception that is not handled, the exception is caught somewhere on Form1, though the exact place that it is caught is largely dependent on where the exception was thrown from. The question is this: I need a means to trap all exceptions raised on Form2 or anything called from Form2 such that no exception EVER propagates out of Form2 to be caught in Form1. The reason for this is that Form2 HAS to perform some cleanup for reasons that I have zero control over. That cleanup doesn not absolutely require user input, but it would be good to have some.Is there any event that is fired if a form is exited due to a call stack unwinding as an unhandled exception propagates up the stack?
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Jan 24, 2010
i did this Dim strUser As String = txtacno.Text cmd1 = New OleDbCommand("Select * from BookDetails Where AccountNo =@acno and MemberId=@memid", con)
[Code]...
the select query that i used in the above code,i have use and in it;so is this a valid sql statement?
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Jul 6, 2009
I'm getting this exception in the designer when I try to look the form that contains the tab control in design mode. After I click OK, the designer simply shuts down
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Feb 9, 2009
I have a program runs with access database. It runs ok on WINXP. However, when I run it on Vista, it shows this exception: system.InvalidOperationException: The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine.
I searched, it seems the exception has some relations with 64bit OS, but my vista is 32bit home version.
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Jan 22, 2009
I want to make some exception catching code a little cleaner, if possible.I currently have the below:
Catch ex As System.Exception
If ex.Message.Contains("opened exclusively by another user") And errCnt < 30 Then
sender.ReportProgress(0, "Waiting for database to become available")
[code]....
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