Control.Remove() increases CPU usage and hangs application

Hey guys,


I have an app where i create a text box dynamically on a control and
user enters something and once looses focus (leave event) i remove it
from the user control.


Once i try to focus another control in the app, Control.Remove() hangs
the app and when i see the stacktrace Control. (app hangs in the
Control.GetNextControl() method.


here is code to create and remove textboxes.
am i missing something? Do i need to use GC.Collect()???


any help would be appreciated.


private void GenerateTextBox(Point location, Size size)
{
if (textArea_ == null)
{
this.SuspendLayout();
/Code for dynamically displaying the textbox for inline editing
textArea_ = new TextBox();
textArea_.Location = location;
textArea_.Size = size;
textArea_.Multiline = true;
textArea_.MaxLength = 200;
textArea_.BorderStyle = BorderStyle.FixedSingle;
textArea_.Leave += new EventHandler(this.textArea_Leave);
textArea_.Font = new System.Drawing.Font("Tahoma", 8.25F,
System.Drawing.FontStyle.Bold,
System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
textArea_.KeyDown += new KeyEventHandler(textArea_KeyDown);


this.Controls.Add(textArea_);
textArea_.Focus();
textArea_.BringToFront();
this.ResumeLayout();



}
}


//Method to remove the dynamic text box from the area
private void RemoveTextBox()
{
if (textArea_ != null)
{
this.SuspendLayout();
if (this.Controls.Contains(textArea_))
{
textArea_.Leave -= new
EventHandler(textArea_Leave);
this.Controls.Remove(textArea_);
textArea_.Dispose();
textArea_ = null;
}
this.ResumeLayout();
}

RobinS
Tue Nov 28 15:34:26 CST 2006

I see this posted in multiple newsgroups. If you're
going to do this, please cross-post, i.e. post it in
all the different newsgroups at one time. That way,
if someone in one newsgroup provides a solution, it is
displayed in all of the groups, and people know it is
solved, and they don't need to spend time on it, and
they can help someone else.

At the very least, since you have multi-posted it,
when/if you *do* get a solution, go post it in the
other groups where you posted this message.

Thanks,
Robin S.
-------------------------------
"kamlesh" <kamleshgk@gmail.com> wrote in message
news:1164743658.723281.232670@h54g2000cwb.googlegroups.com...
> Hey guys,
>
>
> I have an app where i create a text box dynamically on a control and
> user enters something and once looses focus (leave event) i remove it
> from the user control.
>
>
> Once i try to focus another control in the app, Control.Remove() hangs
> the app and when i see the stacktrace Control. (app hangs in the
> Control.GetNextControl() method.
>
>
> here is code to create and remove textboxes.
> am i missing something? Do i need to use GC.Collect()???
>
>
> any help would be appreciated.
>
>
> private void GenerateTextBox(Point location, Size size)
> {
> if (textArea_ == null)
> {
> this.SuspendLayout();
> /Code for dynamically displaying the textbox for inline editing
> textArea_ = new TextBox();
> textArea_.Location = location;
> textArea_.Size = size;
> textArea_.Multiline = true;
> textArea_.MaxLength = 200;
> textArea_.BorderStyle = BorderStyle.FixedSingle;
> textArea_.Leave += new EventHandler(this.textArea_Leave);
> textArea_.Font = new System.Drawing.Font("Tahoma", 8.25F,
> System.Drawing.FontStyle.Bold,
> System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
> textArea_.KeyDown += new KeyEventHandler(textArea_KeyDown);
>
>
> this.Controls.Add(textArea_);
> textArea_.Focus();
> textArea_.BringToFront();
> this.ResumeLayout();
>
>
>
> }
> }
>
>
> //Method to remove the dynamic text box from the area
> private void RemoveTextBox()
> {
> if (textArea_ != null)
> {
> this.SuspendLayout();
> if (this.Controls.Contains(textArea_))
> {
> textArea_.Leave -= new
> EventHandler(textArea_Leave);
> this.Controls.Remove(textArea_);
> textArea_.Dispose();
> textArea_ = null;
> }
> this.ResumeLayout();
> }
>

kamlesh
Tue Nov 28 18:41:22 CST 2006

Hi Robin,

sorry for multi posting.
I wasnt aware of the options.

Will post the solution if i get it in the other news group.

Thanks,
Kamlesh.


RobinS wrote:
> I see this posted in multiple newsgroups. If you're
> going to do this, please cross-post, i.e. post it in
> all the different newsgroups at one time. That way,
> if someone in one newsgroup provides a solution, it is
> displayed in all of the groups, and people know it is
> solved, and they don't need to spend time on it, and
> they can help someone else.
>
> At the very least, since you have multi-posted it,
> when/if you *do* get a solution, go post it in the
> other groups where you posted this message.
>
> Thanks,
> Robin S.
> -------------------------------
> "kamlesh" <kamleshgk@gmail.com> wrote in message
> news:1164743658.723281.232670@h54g2000cwb.googlegroups.com...
> > Hey guys,
> >
> >
> > I have an app where i create a text box dynamically on a control and
> > user enters something and once looses focus (leave event) i remove it
> > from the user control.
> >
> >
> > Once i try to focus another control in the app, Control.Remove() hangs
> > the app and when i see the stacktrace Control. (app hangs in the
> > Control.GetNextControl() method.
> >
> >
> > here is code to create and remove textboxes.
> > am i missing something? Do i need to use GC.Collect()???
> >
> >
> > any help would be appreciated.
> >
> >
> > private void GenerateTextBox(Point location, Size size)
> > {
> > if (textArea_ == null)
> > {
> > this.SuspendLayout();
> > /Code for dynamically displaying the textbox for inline editing
> > textArea_ = new TextBox();
> > textArea_.Location = location;
> > textArea_.Size = size;
> > textArea_.Multiline = true;
> > textArea_.MaxLength = 200;
> > textArea_.BorderStyle = BorderStyle.FixedSingle;
> > textArea_.Leave += new EventHandler(this.textArea_Leave);
> > textArea_.Font = new System.Drawing.Font("Tahoma", 8.25F,
> > System.Drawing.FontStyle.Bold,
> > System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
> > textArea_.KeyDown += new KeyEventHandler(textArea_KeyDown);
> >
> >
> > this.Controls.Add(textArea_);
> > textArea_.Focus();
> > textArea_.BringToFront();
> > this.ResumeLayout();
> >
> >
> >
> > }
> > }
> >
> >
> > //Method to remove the dynamic text box from the area
> > private void RemoveTextBox()
> > {
> > if (textArea_ != null)
> > {
> > this.SuspendLayout();
> > if (this.Controls.Contains(textArea_))
> > {
> > textArea_.Leave -= new
> > EventHandler(textArea_Leave);
> > this.Controls.Remove(textArea_);
> > textArea_.Dispose();
> > textArea_ = null;
> > }
> > this.ResumeLayout();
> > }
> >