How to send data from main form to second form?

Question

I have 2 forms, for example FormA and FormB. In FormA I have 1 textBox, 2 numericupdowns and a button. In FormB i have listBox. I want to type something in textBox, select numbers and press the button on FormA, open FormB and in listBox to be the word i typed in FormA(textbox) and numbers I selected in numericUpDowns.

Please show the code you have written so far, otherwise the question is too broad to be able to give a useful answer. — Krumelur, Feb 08 '20 at 09:28

score 0 · Answer 1 · answered Feb 08 '20 at 09:19

If you open the new form like this:

FormB form = new FormB(...);

you can access its properties and methods:

form.methodX();

With this knowledge, you can store an instance of FormB in a private variable in FormA and create a public method on FormB that will allow you to manipulate the contents of FormB.

public partial class FormA : Form
{
    private FormB formb;

    private void OpenFormB_Click(object sender, EventArgs e)
    {
        this.formb = new FormB();
        formb.Show();
    }

    private void TextBox_TextChanged(object sender, EventArgs e)
    {
        this.formb?.UpdateList(...);
    }
}

How to send data from main form to second form?

1 Answers1