[Solved] Accessing Forms data from another form

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First of all you have to create an instance of Form2.

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
    private Form2 form2;

    public Form1()
    {
        InitializeComponent();
        form2 = new Form2();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        String value1 = File.ReadAllText(textBox1.Text);
        foreach (string line in value1.Split('\n'))
        {
            form2.listBox1.Items.Add(line);
        }
    }
}

}

Your specific error is because of listBox1 is being private. Change it to public and you can access it. 

public System.Windows.Forms.ListBox listBox1;

Also since you already have:

 using System.Windows.Forms;

You can write

public ListBox listBox1;

2

solved Accessing Forms data from another form