Ad:

C# Discussion Thread
Unsolved
Views: 5266

Apr 9th, 2009

Label not updating

Expand Post »

Hey guys,

I've got a multithreaded application done in C# but the label on one of my forms won't update! It doesn't do anything

C# Syntax (Toggle Plain Text)
 
     public IndividualPCSpec(AllKnownDevicesFrm parent)
        {
            m_Parent = parent;
            InitializeComponent();
            m_IPAddressLbl.Text = "HELLO";
        }
 
        public void showInformation(ComputerHardware dto) 
        {
 
            m_IPAddressLbl.Text = "HELLO WORLD";
            this.Refresh();
            this.m_IPAddressLbl.Refresh();
 
            Application.DoEvents();
        }
     public IndividualPCSpec(AllKnownDevicesFrm parent)
        {
            m_Parent = parent;
            InitializeComponent();
            m_IPAddressLbl.Text = "HELLO";
        }

        public void showInformation(ComputerHardware dto) 
        {
            
            m_IPAddressLbl.Text = "HELLO WORLD";
            this.Refresh();
            this.m_IPAddressLbl.Refresh();

            Application.DoEvents();
        }

I don't get why.... it doesn't even get set to "Hello"

Similar Threads

updating jlabel in Java
updating a gridview row in web application in VB.NET
problem in updating the gridview in ASP.NET
Help with GUI. Updating between 2 forms. in C#
Problem updating a JLabel?? in Java

Acidburn

Reputation Points: 12

Solved Threads: 5

Posting Pro

Offline

510 posts
since Dec 2004

Permalink

Apr 9th, 2009

Re: Label not updating

How are you calling this functions?

thoughtcoder

Reputation Points: 231

Solved Threads: 12

Junior Poster

Offline

139 posts
since Mar 2009

Permalink

Apr 9th, 2009

Re: Label not updating

from another class.

C# Syntax (Toggle Plain Text)
Class X
IndividualPCSpec m_individualPC = new IndividualPCSpec (this);
ComputerHardware  dto = new ComputerHardware(...);
..
..
Function X() 
{
showInformation(dto);
}
}
Class X
IndividualPCSpec m_individualPC = new IndividualPCSpec (this);
ComputerHardware  dto = new ComputerHardware(...);
..
..
Function X() 
{
showInformation(dto);
}
}

Acidburn

Reputation Points: 12

Solved Threads: 5

Posting Pro

Offline

510 posts
since Dec 2004

Permalink

Apr 9th, 2009

Re: Label not updating

If you attach a debugger, does it show the line m_IPAddressLbl.Text = "HELLO WORLD"; running?

thoughtcoder

Reputation Points: 231

Solved Threads: 12

Junior Poster

Offline

139 posts
since Mar 2009

Permalink

Apr 9th, 2009

Re: Label not updating

Normally updating labels in a form is not a thread-safe operation. Check this article out:

http://msdn.microsoft.com/en-us/libr...28(VS.80).aspx

That may give you a good idea of what you have to do to update the label. You need to invoke another method to update the label's text. I'm surprised an exception is not being thrown...

alc6379

Team Colleague

Reputation Points: 186

Solved Threads: 147

Cookie... That's it

Offline

2,519 posts
since Dec 2003

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

Previous Thread in C# Forum Timeline: problem transfering data from one form to another

Next Thread in C# Forum Timeline: Trouble with dataGridViewButtonColumn event

DaniWeb Message

Cancel Changes

User Name
Password