In VB.net, I have win form programs that do database update operations that
take several minutes or longer. Several actions such as switching windows or
clicking a control during these operations leave me with a blank form (all
white space inside the form borders) or with a frozen form that will not
display refreshed controls. When the db operations are done, the forms
repaint just fine. What’s happening and what can I do about it? Thanks.
--
John Gates
2  2450 
Your application can't update itself. Look into using a thread or a
System.Timers (not the System.Windows. Form.Timer). Or you can try
Application.DoE vents.
"JohnGates" <Jo*******@disc ussions.microso ft.com> wrote in message
news:9F******** *************** ***********@mic rosoft.com... In VB.net, I have win form programs that do database update operations
that
take several minutes or longer. Several actions such as switching windows
or
clicking a control during these operations leave me with a blank form (all
white space inside the form borders) or with a frozen form that will not
display refreshed controls. When the db operations are done, the forms
repaint just fine. What's happening and what can I do about it? Thanks.
--
John Gates
Run your database operation in a seperate thread. This will prevent the UI
from locking/not responding.
Private Sub myDBOperation()
' long running db operation..
End Sub
Private m_Thread As New _
System.Threadin g.Thread(Addres sOf myDBOperation)
Private Sub Button1_Click(B yVal sender As System.Object, _
ByVal e As System.EventArg s) Handles Button1.Click
m_Thread.Start( )
End Sub
Note that the target of AddressOf in the Thread's constructor can only be a
Sub and not a Function.
More on threading: http://msdn.microsoft.com/library/de...ClassTopic.asp http://msdn.microsoft.com/library/de...syncprocvb.asp
hope that helps..
Imran.
"JohnGates" <Jo*******@disc ussions.microso ft.com> wrote in message
news:9F******** *************** ***********@mic rosoft.com... In VB.net, I have win form programs that do database update operations
that
take several minutes or longer. Several actions such as switching windows
or
clicking a control during these operations leave me with a blank form (all
white space inside the form borders) or with a frozen form that will not
display refreshed controls. When the db operations are done, the forms
repaint just fine. What's happening and what can I do about it? Thanks.
--
John Gates This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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