Why my ListBox doesn't work??

I setup a Form and call another class (e.g. class1.cs). (class1.cs) contains
a command to call back the Form to display a string variable on the listbox.
However, it doesn't works. The listbox gets no response.
Command:
listBox.Items.Add( str );

However, it works when i type "MessageBox.Show( str);". A correct string
displays in the popup message box.

Dear Questions,
A small code snippet goes a long way towards helping others to understand
what is it you are doing wrong

--
Alex Feinman
---
Visit http://www.opennetcf.org
"questions" <questions@discussions.microsoft.com> wrote in message
news:AA18E957-10EE-4943-A9A7-B1E8540BB0D9@microsoft.com...
>I setup a Form and call another class (e.g. class1.cs). (class1.cs)
>contains
> a command to call back the Form to display a string variable on the
> listbox.
> However, it doesn't works. The listbox gets no response.
> Command:
> listBox.Items.Add( str );
>
> However, it works when i type "MessageBox.Show( str);". A correct string
> displays in the popup message box.

////class1.cs
form1.display ( display_message );
////Form1.cs
public void display(string dis_m)
{
MessageBox.Show(dis_m);
listBox.Items.Add("dis_m");
}

/*Message dialog is shown correctly, but the listbox keeps empty, why?*/

"Alex Feinman [MVP]" wrote:

> Dear Questions,
> A small code snippet goes a long way towards helping others to understand
> what is it you are doing wrong
>
> --
> Alex Feinman
> ---
> Visit http://www.opennetcf.org
> "questions" <questions@discussions.microsoft.com> wrote in message
> news:AA18E957-10EE-4943-A9A7-B1E8540BB0D9@microsoft.com...
> >I setup a Form and call another class (e.g. class1.cs). (class1.cs)
> >contains
> > a command to call back the Form to display a string variable on the
> > listbox.
> > However, it doesn't works. The listbox gets no response.
> > Command:
> > listBox.Items.Add( str );
> >
> > However, it works when i type "MessageBox.Show( str);". A correct string
> > displays in the popup message box.
>
>
>

//class1.cs
display ( display_message );
//Form1.cs
public void display(string dis_m)
{
MessageBox.Show(dis_m);
listBox.Items.Add(dis_m);
}

/*Message Dialog display correctly, but the listbox is still empty. Please
help me*/

"Alex Feinman [MVP]" wrote:

> Dear Questions,
> A small code snippet goes a long way towards helping others to understand
> what is it you are doing wrong
>
> --
> Alex Feinman
> ---
> Visit http://www.opennetcf.org
> "questions" <questions@discussions.microsoft.com> wrote in message
> news:AA18E957-10EE-4943-A9A7-B1E8540BB0D9@microsoft.com...
> >I setup a Form and call another class (e.g. class1.cs). (class1.cs)
> >contains
> > a command to call back the Form to display a string variable on the
> > listbox.
> > However, it doesn't works. The listbox gets no response.
> > Command:
> > listBox.Items.Add( str );
> >
> > However, it works when i type "MessageBox.Show( str);". A correct string
> > displays in the popup message box.
>
>
>

Are you sure it's the right listbox? Also, not that it changes anything
significantly, but you have quotes around dis_m in the call to
ListBox.Items.Add

--
Alex Feinman
---
Visit http://www.opennetcf.org
"questions" <questions@discussions.microsoft.com> wrote in message
news:F010AD70-006A-4064-8DED-CC5DB0F9FC6C@microsoft.com...
> ////class1.cs
> form1.display ( display_message );
> ////Form1.cs
> public void display(string dis_m)
> {
> MessageBox.Show(dis_m);
> listBox.Items.Add("dis_m");
> }
>
> /*Message dialog is shown correctly, but the listbox keeps empty, why?*/
>
> "Alex Feinman [MVP]" wrote:
>
>> Dear Questions,
>> A small code snippet goes a long way towards helping others to understand
>> what is it you are doing wrong
>>
>> --
>> Alex Feinman
>> ---
>> Visit http://www.opennetcf.org
>> "questions" <questions@discussions.microsoft.com> wrote in message
>> news:AA18E957-10EE-4943-A9A7-B1E8540BB0D9@microsoft.com...
>> >I setup a Form and call another class (e.g. class1.cs). (class1.cs)
>> >contains
>> > a command to call back the Form to display a string variable on the
>> > listbox.
>> > However, it doesn't works. The listbox gets no response.
>> > Command:
>> > listBox.Items.Add( str );
>> >
>> > However, it works when i type "MessageBox.Show( str);". A correct
>> > string
>> > displays in the popup message box.
>>
>>
>>