Sending Multi-threaded SendEmail Request Returns General Mapi Failure

Mar 5, 2009

I'm using the MAPI code by Dave Brooks.I am attempting to programatically send out a Crystal Report that is generated.When I run through the code without threading everything runs fine. The problem is when I use threading I get the return error "General MAPI failure [2]".I have never used threading before and understand that there are dangers involved. Can anyone provide any insight into this issue? NOTE: I've removed exception handling to make the code clearer.[code]


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Oct 15, 2009

I am using VB5 on a Windows XP SP3 computer.I have an application that send emails to customers that have birthdays today and that bought a product from me today.  If I run the application several times with the same search criteria with the same customers and the same date and time, I "may" or "may not" get the save Emails sent out.I am using a MAPI Signon prior to the birthday select and MAPI Signoff after the birthday select; another MAPI Signon prior to the sales today select and MAPI Signoff after the sales today select.I count the emails that are supposed to be produced in each select above and the counts are correct.  It's the emails that may not agree with the counts.What could cause this?

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Aug 25, 2009

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Jul 13, 2010

I am tring to send e-mail used VB 2008.  Below is my code.  The error message I am getting is "5 Failure sending mail at System.Net.mail.client.send(MailMessage message).I have two questions.  1.) What am I doing wrong? & 2.) Is there a way the get a more description error message.

message As
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I'm trying to teach myself how to create multi-threaded applications in Visual Basic Express 2008.  I found a page headed "Creating Threads and Passing Data at Start Time" in the Library here -


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Apr 5, 2011

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Nov 11, 2010

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Mar 12, 2011

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Aug 27, 2009

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Jul 23, 2009

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2. User can then navigate through the file in 188byte chunks, data is read from disk, decoded, and displayed for each chunk in turn.

3. User may want to search for some data or build a report. This will involve repeating the read, decode, display, function multiple times. During this looping the GUI stops responding and there is no option to cancel so I want to make it multi-threaded. So, is it safe to open the file in the GUI thread and then read from the file in the background thread? I currently use something like this to open the file once:

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Jul 25, 2009

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Aug 25, 2010

I am trying to send email messages from a Windows based Visual Basic application. I am using Visual Studio 2008 and .NET 3.5.  The IP address in the config file is correct.  But this gives an error message: Failure sending mail. 

Dim Mail As MailMessage     
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Jul 16, 2011

Inner exception is "Unable to connect to remote server". I don't understand what I did wrong[code]....

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Dec 4, 2009

I have a console application (VB.NET). When it is started, it spawns worker threads to find work in the database and do the task, then look for the next task (A workflow basically).

The problem that I have is that I have my Event Handler in the main thread that spawns the worker threads. Those workers, if they error, raise an event to a public delegate. However my main thread is not detecting these events, and I cannot figure out how to make it. My intention is to do all logging (text/database), email alerts, and restarting the worker to find another task that is not errored. (This will be expanded in the LogErrorMessage routine and such, for now I am just keeping it a simple Console.Writeline so that I can see if the method is being fired or not)

Here is the code around what I am trying to do:

Logger Class:

Public Delegate Sub LogDelegateError(ByVal Ex As Exception)
Public Class EventLogger
Public Event EventError As LogDelegateError


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May 17, 2011

I am usng a multi threaded process to fire off a task, but when it is completed I want to make a label visible on the main form (form 1), eg "process completed", however the code I have in place comes up with the following error message;

Cross-thread operation not valid: Control 'lblCompleted' accessed from a thread other than the thread it was created on.

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Feb 23, 2009

My application takes the currently logged-in user and uses an a DirectoryServices.DirectorySearcher to pull a few additional detail about them (some properties we have stored in a few custom AD fields, as well as their email address). This works great, though I've always though it was a little slow - my single-threaded code could only make about 2-3 requests/second to AD.

The real problem came when I moved this code to a web server. With multiple simultaneous users, the number of requests/second jumps greatly, and the LSASS.EXE process pegs on my server. I've checked the domain controllers, and they're just fine - the bottleneck is clearly on the application side. I suspect that what's slowing my down is the NTLM/Kerberos challenge/response, and the number of simultaneous requests pegs even the multi-core processor.

Our network policy doesn't allow anonymous reads from AD, so that choice is out. Also, I've tried every member of "AuthenticationTypes" (in the example, I'm using .FastBind), but they all seem to have about the same throughput rate with the same load on the I might work around this restriction and lower my demands on the processor? Here is the code I'm using - pretty straightforward:

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Dim entry As New DirectoryEntry(sPath)
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Aug 4, 2010

This code throws the exception ("SMTP Exception")

Public Function SendAnEmail(ByVal MsgBody As String)
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Jun 22, 2010

I have an Excel based algo-trading app that needs to take in lots of real-time data, and make trading decisions based on the calculations driven by the data. It is not one of those "read-only" stock ticker kinda spreadsheets.I created a COM object with VB.NET that runs in its own thread space which collects data from a socket, and when the data is read it raises an Event with data attached. In Excel VBA, the event handler parses the data, puts them to the right places on the spreadsheet to feed calculations (so far it sounds like a stock ticker app), and then, based on the results of the various calculations it does something.The problem is that when the user starts to click around the spreadsheet while there is large amount of data coming, the event handler's cell updating breaks apart. If the app is left alone without user action, it stands well. My frustration comes from not understanding what happens to the main thread when a user clicks around. Either the event handler blocks the user action, or the user action blocks the event handler (under which case I will put in some queuing facility). But I just don't see how user action can break the code (like causing VBA to stop executing)

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Apr 27, 2012

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Dim testMessage As New System.Net.Mail.MailMessage
Dim fromAddress As New System.Net.Mail.MailAddress("")
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This is the code I tried but it aint working right, shows failure sending mail, unable to connect to remote server. I am using internet via bluetooth through my gprs enabled cellphone.

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May 28, 2010

I was trying to follow a code example I came across the net for programmatically sending email:


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Apr 25, 2011

I have a several form elements that I am dynamically creating with javascript when a user changes a number value in a textbox, by filling the innerHTML of a div like so:

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Dim DFTestValue1 As String DFTestValue1 = Request("textbox" & c.ToString)

where c is a loop counter to the # of textboxes created (the input value mentioned above that triggers the create) The problem here is that this code works in Internet Explorer but not in Firefox or Chrome. The Request() value returns null and nothing is saved. I hope I've explained this well enough.

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May 31, 2012

I'm struggling to return user details from AD using LDAP, after i have authenticated that the user exists. I am using a simple auth method as follows:

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Note: the displayName.text outputs are purely for debug purposes.I have tried various combos of requests but nothing seems to return USER details. ETA: to the security police: this is all within a https connection, I'm not sending passwords about in plain text!

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Feb 15, 2011

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I have a solution in VS 2008 that creates a DLL. I then use that DLL in another application. If I go in to the DLL projects property pages and change the following configuration for a DEBUG build then the built dll no long provides the desired functionality. If I change it back and rebuild the DLL, then the DLL does provide the correct functionality:


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Apr 10, 2011

2003I've implemented Forms Authentication on one particular subfolder on one of my sites. My code works perfectly on my development machine, but there is a slight problem on the live server.If you browse to the admin subfolder, if you are not authenticated, you will be redirected to the login page. The Master Page footer also contains a link to the login page; when the user logs in, that link is supposed to change to a link to the admin page:

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Feb 25, 2010

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Aug 20, 2010

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I'm e-mailing a message from my application to myself, I don't quite understand how to do this, but I did think I had finally gotten it right -


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Aug 3, 2011

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Jul 12, 2011

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