473,890 Members | 1,309 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

SerialPort and "Object reference ..." meggage.

Hi,
I'm already learn cshar language. I have a little problem with
serialport and error message "object reference not set to an instance
of an object".
Serial communication works well, but when i closing application i get
mentioned above error message. It happens on method
"components.Dis pose();". Only when serialport is closed (yes, closed!).
When I open it before "components.Dis pose();", everything is alright.

P.S. I writing on this newsgroup first time. English isn't my native
language so i sorry for it ;-).

Michal

Greetings.

Jul 6 '06 #1
0 1122

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

Similar topics

0
2759
by: Bob Cannistraci | last post by:
A three-tier user authentication system was running without a problem for almost a year and now is suddenly dysfunctional. We don't know of any changes to any of the servers. It's quite maddening. The details: 1) We know the COM+ app is instanced on the COM+ server (Win 2000). The component graphic spins when CreateObject is called. 2) The proxy is installed on an IIS server (Win 2000) with delivers the interface, written in ASP, to the...
2
8933
by: Olaf | last post by:
I have a frameset page witch contains the myFuc() function. The function is accessed from a page in one of the frames in the frameset. An example is shown below. <input onclick="javaScript:alert('document.forms(0)='+document.forms(0)); parent.myFunc(document.forms(0));" type="button" value="Open" name="Button" ID="Button"> The strange part is that the debug alert says that the document.forms(0) is an object så all seem to be well. But...
5
6846
by: Tommy Lang | last post by:
Why doesn't the following code work? I get an error at the following line... CardGroup.PropertyCardType = (CardType)0; The error is "Object reference not set to an instance of an object.", which means the object in question have not been initiated. But I have init the object above n this line... public Card CardGroup = new Card; Anybody knows how to resolve this??
5
2830
by: Robin Tucker | last post by:
Hiya, I'm using mshtml and the web browser control to embed an OLE object in my ..NET application. What I want to do is get a reference to the "object" embedded therein: The HTML looks something like this: <html>
1
2836
by: Chris Magoun | last post by:
I suddenly received an unexpected error in my project. I have been working on this project for some time without this issue. Nothing has changed in the form that caused the exception. A little experimentation shows that I cannot run ANY .NET web project without getting this error: ---------------------------------------------------------------------------- ---- Object reference not set to an instance of an object.
18
28766
by: Microsoft | last post by:
When I try this in my code I alwas get an errormessage: "Object reference not set to an instance of an object" Dim g As System.Drawing.Graphics g.DrawString("Test", New Font("Arial", 12, FontStyle.Bold), Brushes.Black, 0, 0) Why is this? Marc
2
2982
by: louie.hutzel | last post by:
This JUST started happening, I don't remember changing any code: When I click the submit button on my form, stuff is supposed to happen (which it does correctly) and a result message is posted back to the same page at the top of my form alerting the user that their request has been approved or denied. However, the end result is an error message: Error Message: Object reference not set to an instance of an object.
35
3263
by: Chris | last post by:
Hi, I tried to create a class which must change the propety 'visible' of a <linktag in the masterpage into 'false' when the user is logged. But i get the error: "Object reference not set to an instance of an object" for the line 'If mpg.FindControl("lkred").Visible = True Then'. I couldn't find sofar the solution. Any help would be appreciated ... Thanks
0
2660
by: Tamer Ibrahim | last post by:
Hi, Sometimes, I got the following error message when I use ajax calendar control on some aspx pages : Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an...
0
9978
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
10819
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 tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10923
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
10462
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 protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
9633
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, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
7169
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 then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
6045
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4676
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 we have to send another system
3
3277
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

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.