I have never tried to make an extended control using the user control first.
I have made one by just creating a simple code file and setting up my own
class. This code works fine:
---->
[ToolboxItem(true)]
public class VrTextBox : TextBox
{
private Boolean _selectOnEntry = true;
[DefaultValue(true), Category("Behavior")]
public Boolean SelectOnEntry
{
get { return _selectOnEntry; }
set { _selectOnEntry = value; }
}
protected override void OnGotFocus(EventArgs e)
{
if(_selectOnEntry) SelectAll();
base.OnGotFocus(e);
}
}
<----
You will then need to customize your toolbox and add this control to it.
--
Peter
> Jeff Smith spake:
>
> I am trying to create a basic textbox control similar to the Masked Edit
> Control that was in VB. I create a new c# windows application, add a new
> user control called "TestUserControl" and then I go into the code and
> change it to inherit from System.Windows.Forms.TextBox instead of
> UserControl.
>
> It is in my toolbox automatically, but when I drop it on the form I
> get "The control ... could not be loaded. Ensure the library
> containing the
> control has been built and a project reference has been made to
> the library
> containing the control. If you have changed the name of the user control,
> close and re-open the control's designer to update the toolbox item".
>
> I have not changed the name (just the base class), I have compiled the
> project before trying to drop it on the form with the form
> designer. I have
> even tried going to "customize toolbox" and adding a reference to my
> own .EXE file and then I get an additional "TestUserControl" entry in the
> toolbox that when I drop on the form gives me an error of "Object
> reference
> not set to an instance of an object".
>
> What the F$#!@ am I doing wrong? This should be so simple. I have checked
> all over the net. The only suggestions I saw were compiling and adding a
> reference to your EXE.
>
> Thanks,
> Jeff
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