How can I add an item from a textBox in Form1 to a listBox in Form2?

[Erika Domínguez]

Hi,

I'm trying to make a program with 2 Windows Forms. In Form1 there's a textBox and a button, and in Form2 there's a listBox. I want the program to add the items written in the textBox to the listBox after pushing the button. How can I do this? How do I link the 2 Forms?

[Bassem]

Hello Erika,

There are a lot of ways to connect between your two Forms, and the way you should go is up to your requirements.

To have a link between the 2 Forms, one of them should have a reference of the other, so you may declare and instantiate Form#2 from Form#1, for example on the Form#1 loaded event handler:

1. Go create Form1 and Form2.
2. Inside the code behind of Form1. Declare Form2 as a member.(just like any class or struct)

Form2 f2 = new Form2()

3. Double click on Form1, this will add an event handler to the code behind.

private void Form1_Loaded(object sender, RoutedEventArgs e)
        {
}

4. Show Form2.

Form2.Show();

5. Now there is a link between the two Forms, so go and create a public Method inside Form2.

public void AddToComboBox(string fromTextBox)
{
// here is the code to make whatever you want..
}

6. On Form1 on the event handler of your button, access that Method by adding to it the value of the Text property of the TextBox.

f2.AddToComboBox(TextBox1.Text);

Hope that will help.