Beginner question on access modifiers

[Frank]

I have a form implemented as shown below. If I define the tp_
data member as private it is always null in the Click event
handler. When I remove private and let it use the default
access ( which I think is private ) then it is ok ( non null ) in the
Click handler. I don't understand why?

public partial class Properties_Form _TiePoint : Form
{
// this declaration works ok
Tiepoint tp_ = new Tiepoint();

// this one doesn't
// private Tiepoint tp_ = new Tiepoint();

public Tiepoint ImageTiePoint
{
get { return tp_; }
set { tp_ = value; }
}

public Properties_Form _TiePoint()
{
InitializeCompo nent();
//tp_ is ok here
}
private void OKButton_Click( object sender, EventArgs e)
{
// tp_ is null if declared with private
tp_.Name = TiepointName_Te xt.Text;

DialogResult = DialogResult.OK ;
}
}

Thanks for any answers
Frank

[Mattias Sjögren]

I have a form implemented as shown below. If I define the tp_
data member as private it is always null in the Click event
handler. When I remove private and let it use the default
access ( which I think is private ) then it is ok ( non null ) in the
Click handler. I don't understand why?

No, it doesn't make sense. As you said yourself, private is the
default so the result should be the same. I think there's something
else in your code that's causing it. Can you simplify your code to a
small complete program that reproduces the problem?
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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