Hi

How do i populate a listbox in window1 from window2.

Have a lisbox named"listbox1" in window1.

Cant just write "listbox1.Items.Add()" to populate the

listbox from window2

Regards Fredric

What your suffering from is a lack of a dataclass. Where you have:

Form1

| dataclass (Containing all multiform data)

Form 2

Your application is a prime example of when to use this kind of model.

This way what ever the form is in the application as long as you pass the instance of the dataclass your forms will have access to the same data. This is normally done using a view class but I feel this may be getting ahead of your self.

For now create a new class called switchData, in switch data define the following methods:

/// Inside your name space

class switchData

{

string[] strList = new string[10];

int intPointer = 0;

public void addToStack(string strNew)

{

strList[intPointer] = strNew;

intPointer++;

}

public string[] GetStack()

{

return strList;

}

}

Then when you want to access your stack you can simply,

private void Form1_Load(object sender, EventArgs e)

{

Mydata.addToStack("Test");

Mydata.addToStack("Test2");

Mydata.addToStack("Test3");

}

// On form 2 you will need...

private void Form2_Load(object sender, EventArgs e)

foreach (string strItem in Mydata.GetStack())

{

if (strItem != null)

{

comboBox1.Items.Add(strItem);

}

}

To pass this to another form you will need,

public void setMyData(switchData tmpData)

{

Mydata = tmpData;

}

Thus when you call the 2nd form you will need to:

form2 Myfrm = new form2;

Myfrm.SetMyData(Mydata);

Myfrm.Show();

What I just wrote will seem really confusing but it a VERY simple solution to what your trying to do, you would be much better with stacks to store the data. To read up on what this model is about then have a look at : http://www.c-sharpcorner.com/Code/2003/Feb/MVCDesign.asp

Hope this helps

Hi.,
you should implement one public method in Form1 which add item to listbox1.Items. In my opinion, you should not give public access to your controls in form1. And passing form1 as parameter to form2 constructor is only pass the reference of form1; not a new instance. If you don't have the reference of form1, how can you access it.?

public class Form1 : System.Windows.Form
{
...
...
...

public void AddItemToListBox(object item)
{
this.listbox1.Items.Add(item);
}
}

public class Form2 : System.Windows.Form
{
private Form _form1;

public Form2(Form form1)
{
_form1 = form1;
}
...
...
...

private void button1_Click(object sender, System.EventArgs e)
{
_form1.AddItemToListBox(something);
}
}

Hi,

Is this a web application or windows application.

If it is windows application. you can remove the listbox1 from window2 and add it to window1 like

window1.controls.Add( listbox1);

before that you can set the listbox1 properties like position, size and etc...

-Thanks

Mahesh

Ok

It is a window application.

I think i described it wrong before.

In window2 i calculate som stuff, and a whant to put that stuff into the lisbox in window1.

Regards Fredric

I am really stupid because i cant get this to work.

I have changed the Modifiers of the listbox1 to public in the properties.

The class name of window1 i Form1.public partial class Form1 : Form

I tried this i window 2.

private void button2_Click(object sender, EventArgs e)

{

Form1 test = new Form1();

test.listBox1.Items.Add("Hello");

}

What your suffering from is a lack of a dataclass. Where you have:

Form1

| dataclass (Containing all multiform data)

Form 2

Your application is a prime example of when to use this kind of model.

This way what ever the form is in the application as long as you pass the instance of the dataclass your forms will have access to the same data. This is normally done using a view class but I feel this may be getting ahead of your self.

For now create a new class called switchData, in switch data define the following methods:

/// Inside your name space

class switchData

{

string[] strList = new string[10];

int intPointer = 0;

public void addToStack(string strNew)

{

strList[intPointer] = strNew;

intPointer++;

}

public string[] GetStack()

{

return strList;

}

}

Then when you want to access your stack you can simply,

private void Form1_Load(object sender, EventArgs e)

{

Mydata.addToStack("Test");

Mydata.addToStack("Test2");

Mydata.addToStack("Test3");

}

// On form 2 you will need...

private void Form2_Load(object sender, EventArgs e)

foreach (string strItem in Mydata.GetStack())

{

if (strItem != null)

{

comboBox1.Items.Add(strItem);

}

}

To pass this to another form you will need,

public void setMyData(switchData tmpData)

{

Mydata = tmpData;

}

Thus when you call the 2nd form you will need to:

form2 Myfrm = new form2;

Myfrm.SetMyData(Mydata);

Myfrm.Show();

What I just wrote will seem really confusing but it a VERY simple solution to what your trying to do, you would be much better with stacks to store the data. To read up on what this model is about then have a look at : http://www.c-sharpcorner.com/Code/2003/Feb/MVCDesign.asp

Hope this helps

You are newing an instance of Form1, it is not the same as the one you already have! Declare this in Form1:

public static Form1 GetForm()

{

return this;

}

and then in Form2, call:

Form1.GetForm()._Any_Call_in_Form1;

--

cheers

farshad

Passing a form instance is a solution but not really a good practice.

Hi.,
you should implement one public method in Form1 which add item to listbox1.Items. In my opinion, you should not give public access to your controls in form1. And passing form1 as parameter to form2 constructor is only pass the reference of form1; not a new instance. If you don't have the reference of form1, how can you access it.?

public class Form1 : System.Windows.Form
{
...
...
...

public void AddItemToListBox(object item)
{
this.listbox1.Items.Add(item);
}
}

public class Form2 : System.Windows.Form
{
private Form _form1;

public Form2(Form form1)
{
_form1 = form1;
}
...
...
...

private void button1_Click(object sender, System.EventArgs e)
{
_form1.AddItemToListBox(something);
}
}

Thanks all !!!!!

Finally i got the program to work.

Best regards Fredric

So,

Please mark your answer.

Thanks.

soemoe