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Windows Forms: Give Your .NET-based Application a Fast and Responsive UI with Multiple Threads

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

If your application performs any non-UI processing on the thread that controls the user interface, it may make the app seem slow and sluggish, frustrating users. But writing multithreaded apps for Windows has long been restricted to C++ developers. Now with the .NET Framework, you can take advantage of multiple threads in C# to control the flow of instructions in your programs and isolate the UI thread for a fast and snappy user interface. This article shows you how. Also, it discusses the pitfalls of multiple threads and presents a framework for safe concurrent thread execution.

Ian Griffiths

MSDN Magazine February 2003

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Application Architecture in Windows Forms 2.0

Applications have special support in Windows Forms. For starters, you can manage and tailor your application's lifetime, and, when the work flow is disrupted by an unhandled exception, you can choose from several methods of response. Then, there are several application models that you can employ, including Single Document Interface (SDI) and Multiple Document Interface (MDI) applications, each of which can support either multiple-instance or single-instance mode, the former the VS05 default and the latter requiring special consideration. All applications, however, can discover and use a wide variety of information about the system and environment they execute in.

Application Architecture in Windows Forms 2.0-Single-MDI Applications

Consider an MDI application like Microsoft Excel; files opened from the file system (by double-clicking) are all opened as separate child windows within the parent Excel window.7 For the first instance of an MDI application to open a new child window to display the file that was passed to the second instance of the application, the second instance must be able to communicate with the initial instance.

Forms based users being prompted for windows authentication login for My Sites photos in user lists

Here's an issue I didn't see coming for our forms based authentication users. 

We have a web application extended to an external url to handle forms based authentication for users outside of our domain. Our setup looks like this...

Internal Users/Windows Authentication - moss.domain.com
External Users/Forms Based - mossext.domain.com
My Site for Internal Users - mysites.domain.com

When our forms based users are accessing user lists, or discussion pages that display user pictures, they are getting a windows authentication login for our internal users (mysites.domain.com) who have populated their my site with personal photo.

How do we fix this? 

Forms Based Authentication on Extranet Application

I have a web application that is using classic authentication. I have extended it to my extranet so I can use https from the outside. All of this works, except I would like to have the extranet users not have to type domain\username. I am guessing I need to use claims based authentication with forms. It seems the only way to do this, would be to go back in time, and tell my original application to use claims based instead of windows. Is there a way I could have just my extended site use forms? I would really like to keep my extranet users out of active directory, as they are not part of my company.

How to add Sharepoint dll reference to Windows Forms application project in Visual Studio 2010?

Hi,I am using Windows Forms application template in Visual Studio 2010 Beta. I created this for some R & D work. Now I am using Sharepoint object model in application. When I am trying to add Sharepoint dll reference from .NET tab, I can not see Windows Sharepoint Services there Which was available in Visual Studio 2005.Also If I am add this sharepoint dll from ISAPI folder (14 Hive), it is added succesfully, but it is not taking actually in project and showing me an error during running mode that theError 12 The type or namespace name 'SharePoint' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) Please suggest me how to add Sharepoint dll reference in Windows forms application in Visual Studio 2010?

Windows Forms application Stopped Working message in Windows Vista



A Windows Forms application developed with VB2008 Express that has been successfully run on two Windows XP systems and a Windows 7 system fails to run on two of two Windows Vista systems tried so far.


Attempting to run the app on a Windows Vista system results in a system dialog box titled, Microsoft Windows, with the message, A problem caused the program to stop working correctly.  Windows will close the program and notify you if a solution is available.  A single button at the lower right of the dialog contains the text, Close Program.
The initial form of the application never displayed and the dialog above appeared with little delay after attempting to start the program.

The program uses an SQL Server Compact Edition 3.5 database and the program is compiled to include the following .DLL files so the user does not need to install SQL ServerCE.

The Load event of the initial form causes a DataSet to be filled from the SQL CE DB.

I have the System Informa

I need a dynamic connection string for my windows forms application.


Hello folks


I am brand new to forms applications and visual studio 2008 I am building a forms application to connect to a 3rd party's sdf file. There is no password or username required to connect however the 3rd party app installs the sdf in the users folder for me I am on windows 7 but I have clients on xp.


I went to add a data connection and chose sql ce file and browsed out to my location and it connects and works. But I need this connection string to be for whoever is logged into there laptops or computers no matter the operating system version xp,vista,7.


Data Source=C:\User\username\AppData\Roaming\PS\GES\surve.sdf


Can someone tell me how to do that. Also please explain in words a new borne could understand cause like I said I am new to this.


Thank you


How to make the windows forms application install only 1 time and be used only 1 time only



I have a need to create an applicaiton that can be installed 1 time only be a user. The application can also be used only 1 time. (on a given PC)

The user may or may not be and administrator.

How can I do this (without registry alteration if possible)?

Thanks much.


SQL Server 2005 random login failures for windows forms application


One of our VS .NET 2008 windows forms applications runs from multiple client machines. The application randomly has login failures from random machines and from random places in the code. The login works almost every time but about once every fifteen minutes an error shows up in SQL Server error logs from a random user. We are running a clustered SQL Server 2005 system and the database is in 2005 (90) mode.

The following error appears in the SQL Server error logs:

Login failed for 'App_Login'. [CLIENT: XXX.XXX.X.XXX] Error: 18456, Severity: 14, State: 16.

The following error is what the client sees:

To create Multiple Instances in windows application?


we are running multiple instances of application.we want to have  connection string seperate for each instance as long as instance is running?

How to achieve?

application created in .net 3.5

Please Help.

How to hide SQL Server password from user in an Windows Forms Application?


Using - VS 2005, SQL Server 2005 Express, Windows Forms Application


I am unable to find a way that hides the password to connect to database in case of a Windws Forms Application.

- app.config is accessible to the user, so connection strings an be read.

- app.config can't be encrypted as in case of ASP.NET applications

- hardcoding the password in the application in connectionstring still makes it possible to be discovered by a user

Vibhor Agarwal

migrate from windows to forms in claims based authentication


Hi friends,

               I am using sharepoint2010 forms based authenticaion (claims based) configure all the web.config files and its working fine.Now I want to change this applicaion to windows authentication (claims) what are the things to follow to change the application to windows and vice versa.I refer few links but they are referring from  classic to claims and many other things not my req..!



Please tell me if a Windows Forms Application is appropriate for my needs:


Because A. I am a total newbie to this and I don't want to get halfway through my project only to realize that I should be writing an ASP.Net Web Application or a WPF Application and I need to completely redo my code.

So: what I want to create is a desktop app with several different buttons on the main form. Clicking on each of those different buttons will query some database tables (I guess I'll be using SQL Server Express Edition since it's free and easy and the database tables shouldn't be more than 1 GB.) The results of these SQL select queries will form the basis of several professional reports that the user will see. I guess the reports will be Crystal Reports, since that comes pre-installed with Visual Studio and there's a lot of documentation on it, so most problems I run into should be easy to solve.

This is a Windows Forms Application, right?

Unable to set cookies when accessing WCF from Console or Windows Forms Application


Hi all,

I am trying to consume wcf service from a console application. WCF service is hosted in IIS 7.0 and its secured using SSL. I have added the service reference in the console app. While making a call to the service i have to pass cookies with the call. Usually in silverlight or web application, i can find cookiecontainer object for every wcf service object. But i cant find it in console app environment. I have set AllowCookies=true in the app.config file.

any help would be appreciated


How to programmatically add controls to Windows forms at run time by using Visual C#

Create a Windows Forms Application
Start Visual Studio .NET or Visual Studio 2005 or a later version, and create a new Visual C# Windows Application project named WinControls. Form1 is added to the project by default.
Double-click Form1 to create and view the Form1_Load event procedure.
Add private instance variables to the Form1 class to work with common Windows controls. The Form1 class starts as follows:

How to Localize Windows Forms and Change the Language at Runtime

Localization is the process of customizing your application to a particular language, culture or locale. Visual Studio provides support for localizing Windows Forms with much ease. In this article, we will see how to localize windows forms and give the user the ability to change to his preferred language at runtime.
When you run a localized application, the appearance is determined by two culture values. The UICulture property is used to specify which resource files will be loaded for the form. The Culture property, on the other hand, determines how strings such as dates, numerals, and currency amounts are formatted.
Let us see the steps required to create a localized form. You can then expand this example and adopt the same approach for the rest of the forms in your project
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