C# Text don't display on another form after double clicking an item in listbox

Question

I\'m doing a winform which consist a listbox (listbox10) with some items on it. When I doubleclick an item, it will show another form (Form3) which consist a textbox (textbo

Answer 1

This is how you can access the member of the other form.

msgForm3 = new Form3();
msgForm3.textBox1.Text = listBox10.SelectedItem.ToString();
msgForm3.Show();

EDIT:

From the Form3.Designer.cs file just change protection level from private to public.

Replace

private System.Windows.Forms.TextBox textBox1;

To

public System.Windows.Forms.TextBox textBox1;