how to use backgroundworker for open MdiChildren form. -in vb.net

Question

3.00/5 (2 votes)

See more:

how can i open child forms for dash board on main form(mdi parent form) using backgroundworker
or thread into vb.net.

VB

Private Sub Main_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
     bWorker.RunWorkerAsync()
End Sub

Private Sub bWorker_DoWork(ByVal sender As Object, ByVal e As _
  System.ComponentModel.DoWorkEventArgs) Handles bWorker.DoWork
      ViewDashBoard() 'this is my method to show child forms on dash board
End Sub

i used dash board to show user detail like to do list,contacts etc. on main from so its
take more time so my main form loading time is increase thats why i want to use backgroundworker.

help me please. :-)

Posted 16-Mar-11 20:10pm

Piyush M Vadukiya

Updated 16-Mar-11 23:10pm

v6

Add a Solution

Comments

TweakBird 17-Mar-11 2:21am

can you share your effort.?

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

thatraja · Answer 1 · 2011-03-16T20:29:00

Solution 1

Actually I have seen similar question in CP many times recent days(within a week), so please browse from this CP search.

Backgroundworker in vb.net - CP search[^]

Posted 16-Mar-11 20:29pm

thatraja

Tarun.K.S · Answer 2 · 2011-03-16T21:03:00

Actually you are missing the point here. Do check out the search results from the link given by thatraja.

You have missed an important thing here, the RunWorkerCompleted event.

Basically in the sub bWorker_DoWork, you can calculate the result of the list and your contacts but you cannot update the UI controls(controls in your form) in the Do_Work. You have to store the results in e.Result of the Do_Work.

Suppose you have a ListBox which stores the list, calculate what you wanted to store in the ListBox and then write :

e.Result=list

You cannot update the ListBox in this function, you will receive an error if you do so.

Next step is to use the RunWorkerCompleted event by doing this :

VB

AddHandler(backgroundWorker.RunWorkerCompleted,AddressOf(back_RunWorkerCompleted))

So in the function back_RunWorkerCompleted, you can get the result of the Do_Work using e.Result. (e is in the Argument of RunWorkerCompleted).
Then you can update your UI Controls using that Result. So now your ListBox can be updated here with the e.Result.

You can check my blog here : http://tarundotnet.wordpress.com/2011/03/14/using-backgroundworker-in-wpf-applications/[^], its in WPF, but i have explained there.

Hope it helped! :)