473,466 Members | 1,503 Online
Bytes | Software Development & Data Engineering Community
Create Post

Home Posts Topics Members FAQ

Error 'Class already exists' when creating windows forms.

Hy,

In my application I create instances of windows forms into different
AppDomain.
If I repeat 5 times the following sequence:

- Creating AppDomain;
- Creating instance of windows form into AppDomain;
- Closing the form;
- Unloading AppDomain;
I get this error:
Type: System.ComponentModel.Win32Exception
Messagge: Class already exists
Component: System.Windows.Forms
Class: System.Windows.Forms.NativeWindow+WindowClass
Method: RegisterClass

Has anyone experience with this error or have suggestions on the cause?
Thanks in advance.

Luigi Lucchi
Italstudio s.r.l.

Nov 21 '05 #1
0 1578

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

5
by: Tony Wright | last post by:
Hi, I am having a problem installing an msi for a web site. The error message I am getting is: "The specified path 'http://mipdev05/features/Fas2' is unavailable. The Internet Information...
0
by: Matt Warner | last post by:
Hi guys, A couple of people have already posted questions about similar issues but haven't had any response. Occasionally, sometimes after running the app for a few hours, it bombs out saying...
8
by: pmud | last post by:
Hi, I am using a compare validator in asp.net application(c# code). This Custom validator is used for comparing a value enterd by the user against the primary key in the SQL database. IF the...
3
by: Adriano | last post by:
Hello, when I try to print something, either DataGrid or from Crystal Report viever the folowing error message appears and cancels printing: Object reference not set to an instance of an...
2
by: David Buchan | last post by:
I have written a program to write some text to a file. Currently, if the file already exists, the program simply overwrites it. What I'd like to do, is have the program ask me if I wish to...
0
by: Nonee | last post by:
Hello- I have a form with the mediaplayer referenced to play mp3's and avi's and I believe that is what is causing the problem. I am not sure, but I am hoping. Anyway, I "published" the vb.net...
0
by: Nonee | last post by:
Anyone, anyone? : ) Hello- I have a form with the mediaplayer referenced to play mp3's and avi's and I believe that is what is causing the problem. I am not sure, but I am hoping. ...
9
by: bill | last post by:
I keep getting Object reference not set to an instance of an object error when trying to run my application on an installed client machine. I installed it on several others and it runs fine. I...
11
by: xenoix | last post by:
hey there, im reasonably new to C# and im currently writing a backup application which im using as a learning resource. My PC :- Visual Studio 2005 .NET Framework 2 Component Factory Krypton...
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
0
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...
0
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...
0
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and...
0
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The...
0
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated ...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.