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VB.Net - Loop putting Data in a Label or Textbox

Posted on 2013-05-29
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Last Modified: 2013-05-29
Good Day Experts!

I have a longer running Select statement that I display in a DataGridView.  It runs for a "while" so I want to keep the User company by displaying data from each record in a label or textbox on the form.  However, that is not the problem I am faced with.  Issue is I can't get the data to show in the control!  

Here is what I have:

Dim AccountNumber As String = rdrGetAccountNumbers.Item("Account Number")
lblAccountIC.Text = AccountNumber
txtAcctNum.Text = AccountNumber

When stepping through the code and I hover over lblAccountIC.Text  and  txtAcctNum.Text the data is there...it just isn't showing on the screen.  

I am probably totally missing something very simple, but what do you think?

Thanks,
jimbo99999
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Question by:Jimbo99999
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2 Comments
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 125 total points
ID: 39205265
It's not showing (most likely) because you are running this logic on the main thread of your application...which just happens to be the same thread that all GUI actions occur on. You are basically locking up your GUI until the loop finishes.

As a quick-and-dirty fix, you can add a Applications.DoEvents() call within your loop code.

e.g.

For i As Integer = 0 To SomeUpperBound
    ' Some processing logic

    Application.DoEvents()
Next

Open in new window


This should allow the GUI to update itself while the loop is running. The more preferred way would be to use a BackgroundWorker or a separate thread to run the loop logic, passing message back to the GUI thread that can be used to display on your form.
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Author Comment

by:Jimbo99999
ID: 39205508
That is awesome...I never knew that and it makes sense now.  I will read up on the BackgroundWorker and seperate thread idea.

Thanks for the help,
jimbo99999
0

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