c# - Passing data between forms

Question

I have two forms. First, Form1 has a group box, some labels and a listbox. I press a button and new Form2 is opened and contains some text. I want to transfer the text in Form2 to the listbox in the Form1.

So far, what I have done is make modifier of listbox to public and then put this code in the button of Form2

Form1 frm = new Form1();
frm.ListBox.items.Add(textBox.Text);

But amazingly, this does not add any value. I thought I was mistaken with the insertion so I made the same procedure. This time, I made a label public and added textbox value to its Text property but it failed.

Any ideas?

Answer 1

Try adding a parameter to the constructor of the second form (in your example, Form1) and passing the value that way. Once InitializeComponent() is called you can then add the parameter to the listbox as a choice.

public Form1(String customItem)
{
  InitializeComponent();
  this.myListBox.Items.Add(customItem);
}

// In the original form's code:
Form1 frm = new Form1(this.textBox.Text);