VS 2008 (TcpClient) User/User Connection Circular Reference?

Aug 22, 2010

I have multiple TcpClient connections to my program. The connections exist as instances of a UserConnection class, that fires events on logon attempt and when receiving messages. My program also holds a Users object, which is a list of a User class objects, holding saved data (username, password etc) for each user that is allowed to log in.

It seems convenient to put a reference object of the respective user, in the UserConnection class (when successful login is verified). Hence, when an event is raised by the connection, the connection object will hold the user reference. As any event handler logic will need to know which user is responsible for the event.

If I don't make a user reference in the UserConnection class, then I need to loop through the users (less than 20) each time, to find the correct user. Not a big deal maybe, but i'm looking to understand how it would be done by an experienced programmer.

When data needs to be sent to a user, I need to access a UserConnection object. Hence the User class also holds a reference to the UserConnection class.

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Error Login Failed For User ''. The User Is Not Associated With A Trusted Sql Server Connection

Oct 2, 2008

Dim sqlConn As New SqlConnection("Server=.\SQLEXPRESS;uid=;pwd=;database=ContactManager")
sqlConn.Open()

Above is my connection string, The programs runs up until sqlConn.Open() and then i get the same error, using no UID and Pass, or using a uid and pass.

Login Failed For User ''. The user is not associated with a trusted sql server connection

I have the SQL Servers authentication se to Windows Authentication and SQL Authentication. I'm using Visual Studio 2005 and SQL Server 2005.

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Login Failed For User ' '. The User Is Not Associated With A Trusted SQL Server Connection

Jul 29, 2011

i am having a console application. I am trying to connect to a sql server.

my connection string: Data Source=<Some server>;Initial Catalog=<some database>;Trusted_Connection=True.

when i am executing on my local machine it runs successfully. But when i am trying to run it on a server it is giving me the following error:

Login failed for user ' '. The user is not associated with a trusted SQL Server connection.

do i have to change my connection string? if so what it should be?

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Is there a way to time out the connection? And loop to retry until it can connect?

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I have herd that a new type (or old type) of connection when the server connects to the client. Is it really possible to do such a thing with mulit-Servers trying to connect to one client.How would I make one like that O.o.

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.net - Dll Reference Count In A Circular Reference Situation In C# 4.0?

Sep 19, 2011

Iam maintaining a large code base I have inherited (ported from vb6 to C#.net 1.1, then to .net 2.0/c# and so on). I have this scenario.My main project references two DLLs - DLL-A and DLL-B

DLL-B references DLL-A. Both dll's and my main project are in 3 separate namespaces.

1) Are 2 copies of DLL-A being loaded in memory ? (dll ref count)

2) How do I find out how many copies of a .net dll is loaded in mem ? (which tool is normally used)

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VS 2008 - How To Get OLEDB Connection String To User Folder

Jul 17, 2009

I have a script that checks a version table from one mdb (server) and compares it to the same table in another mdb (user folder), if the version number is mismatched it needs to replace that file from the server, to the user folder. The problem is, how to get the OLEDB connection to the user folder since, the folder destination is
E:Configurator & UserName & Detail2004.mdb
How to set this up?

Here is my code:
Dim UserName As String = Environment.UserName.Substring(Environment.UserName.LastIndexOf("") + 1)
Dim connectionString2 As String = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=C:Configurator" & UserName & "Detail2004.mdb"
Dim con2 As New Data.OleDb.OleDbConnection(connectionString2)
Dim cmd2 As Data.OleDb.OleDbCommand

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I have created a TextBox array where certain cells are assigned a number which I do not want the operator to change either intentionally or inadvertantly.The relevant TextBox cells are identified by their BackColor, (in this case LightBlue)If the cell is changed the original content is immediately assigned to the cell and a relevant message is displayed.My problem is that by changing the value back to its original value I create another TextChanged event and the consequence is that the MsgBox is displayed twice, one after the other.I have avoided the problem by not displaying a message box. The outward appearance is that the TextBox is not changed at all, which of course is my aim.However I would prefer to display a message box.An example of the scenario is shown below.

Another bewildering fact, (to me), is that in the example below, if the check is not made of the BackColor but instead the value of the TextBox the problem doesn't occur

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
If TextBox1.BackColor = Color.LightBlue Then[code]...

In the example above, if in the Text_Changed event handler the 'Remark' is changed from one 'If' statement to the other the differences in the result can be seen.

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Sep 1, 2010

I've got a requirement where I need to calculate a value, however also refer to this value when calculating it. So I've got for example[code]...

I can see how this can be achieved in excel using Circular Reference, however I'm not sure how I go about it when using VB.Net. Is there a similar method to create a Circular Reference as in excel or any other way I can possibly work out the TotalValue?

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How can i close my vb.net application when user shutsdown, restarts, log off or switches user?

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C# - Delegate Event To Form Without Creating Circular Reference

Jun 19, 2012

I have a class that is in an assembly due to being required for other projects that I'm currently working on. One class lets call it Class Factory, creates a group of controls which require click event handlers to be attached, I have algorithms which determine polymorphic behavior based on certain features but that is relatively irrelevant.

Due to the event handler having to open up a specific form that isn't part of my assembly, and that form requiring this "Factory" class. Without creating circular reference is there any way I can essentially "delegate" the handler event for the form to define? As a simple work around I have had to maintain two separate classes, one in the project with the form and one in the assembly.

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.Width = 1500
Dim panel As New Panel
panel.Location = New Point(0, 0)
panel.Size = New Size(1000, 200)
[Code] .....

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Aug 15, 2009

i know how to make a tcp ip connection using tcpclient and so on. But what i want to know, how to transfer file in a specific computer?

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I am writing a VB.NET app that connects to a legacy application using TCP.

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[Code]...

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I do not want to store it is session. If anyway has a clever way of doing this in .NET let me know ?

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Private Sub DataAccess()
Dim errHandle As New ErrorHandler
Dim lobjCommon As New eCopsCommonFunctions

[code].....

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I am beginner in Vb.net. I try to connect SQl server from VB.net by ADO.net but has run time error in this line.
connection.open ()

Error say:
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This is my code:
Imports System.Data.SqlClient
Public Class Form1
Dim ConnectionString As String
Dim Connection As SqlConnection
Dim Adapter As SqlDataAdapter
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[Code]...

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[Code]...

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