Question

I have one Form, that opens another one. The user writes some information here. When closing this second Form, on the first one, I need to use the previously added information.

(The added information is a string- an email address, and I would add it to listbox items in the first Form.)

I tried Close(), or Hide(). But no matter what was the order I got problems with the new Form closing when it opened, or it didn’t open at all.

Answer 1

You could a string property to the form that will contain the value. It will simply expose the value of the private email field.

For example:

public class SomeForm : Form
{
    public string Email
    {
        get
        {
            return txtEmail.Text;
        }
    }
}

and then from some outside form you could show the form and read the value that was entered into the Email field once the form is closed:

using (var form = new SomeForm())
{
    if (form.ShowDialog() == DialogResult.OK)
    {
        string email = form.Email;
        // do something with the email
    }
}