C# form1 and form2 - listboxes, dialog

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Hello, I'm working on a project. And I have a listbox in Form1 and a listbox in Form2. What I have already done is that I have a button that adds values from numericUpDown to listbox in Form1 (values from 1 to 999999). What I need help with is that when I open the dialogbox(Form2) it should showcase values from listbox(Form1) which are between and including 1-100 in listbox(form2). After clicking a button named "yes" it should save all the values from listbox(form2) to a text file.

Thank anyone willing to help.

What I have tried:

Tried anything within my powers.

Posted 12-Mar-20 7:08am

Member 14771221

Updated 12-Mar-20 22:36pm

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ZurdoDev 12-Mar-20 13:16pm

You have several different requirements. Where are you stuck?

Member 14771221 12-Mar-20 13:23pm

I'm stuck at the showcasing the values ranging from 1 to 100 in the listbox in form 2. I don't know how to transfer them from form1 to form2

ZurdoDev 12-Mar-20 13:17pm

Saving to a text file is very easy, so just google c# save text to file.

Passing values from one form to another can be done many different ways so google that as well.

Member 14771221 12-Mar-20 13:24pm

I tried to google it many times. If I understood it I wouldn't be asking for help right now.

ZurdoDev 12-Mar-20 13:29pm

First google result, c# - Send values from one form to another form - Stack Overflow[^]

Member 14771221 12-Mar-20 13:33pm

I will try that, thank you.

2 solutions

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phil.o · Answer 1 · 2020-03-12T07:33:00

Solution 1

You could give Form2 a constructor accepting an enumeration of integers as parameter, which you would use to populate the second listbox:

C#

public Form2()
{
   InitializeComponent();
}

public Form2(IEnumerable<int> values) : this()
{
   theSecondListBox.Items.AddRange(values);
}

You would then instantiate the Form2 instance by using the new constructor:

C#

// In Form1:
Form2 form = new Form2(theFirstListBox.Items.Where(i => i > 0 && i < 101));

Posted 12-Mar-20 7:33am

phil.o

Comments

Member 14771221 12-Mar-20 14:03pm

I don't really know how to implement it into my code. It seems like it's beyond my understanding of c#.
-----------------------------------------------------------
private void Pridej_Click(object sender, EventArgs e)
{
listBox1.Items.Add(Hodnota.Value);
Hodnota.ResetText();
}

private void Odeber_Click(object sender, EventArgs e)
{
int smaz = listBox1.SelectedIndex;
listBox1.Items.RemoveAt(smaz);
}

private void Form1_MouseClick(object sender, MouseEventArgs e)
{
using (Form2 form2 = new Form2())
{
if (form2.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.Text = form2.SelectedText;
}
}
}

This is os far in my Form1 (as the stuff to add and remove values to/from listboxForm1)

Form2 is dialog windows/box. Is empty for me. Except for simple SelectedText { get; set; }

phil.o 13-Mar-20 4:53am

Then you will have to get deeper into your "understanding of c#". This is pretty basic stuff: constructors, method parameters, instances.
I already showed you how to modify your Form2 class so that you can instantiate it with a list of integers, as well as the way to instantiate it on Form1 to take advantage of the new constructor. The code block in your comment shows that you did not even try to apply it to your existing code. Maybe you are really missing the very basic stuff about C# / OOP / Windows Forms; in that case, I can only advise you to follow a serious tutorial about them before trying to implement any concrete solution. We can eventually provide some useful links for that, if you need.

Maciej Los 13-Mar-20 4:36am

5ed!

Maciej Los · Answer 2 · 2020-03-12T22:36:00

Solution 2

In addition to @phil.o solution, i'd suggest to read these very interesting tips/articles:
Transferring information between two forms, Part 1: Parent to Child[^]
Transferring information between two forms, Part 2: Child to Parent[^]
Transferring information between two forms, Part 3: Child to Child[^]

Posted 12-Mar-20 22:36pm

Maciej Los

Comments

phil.o 13-Mar-20 4:55am

Good links :)

Maciej Los 13-Mar-20 5:05am

Thanks ;)