[Solved] How to make buttons from one form affect a listview in another one?

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You need to have a reference to the other forms from the form that invokes the action.
One way is to expose the ListView as a property on the Form itself and the just reference it via the Form

From Form1

private void button4_Click(object sender, EventArgs e)
    {
        Form2Instance.MyListView.Items.RemoveAt(0);
    }

In Form2 add the following wrapper to expose the original listView

public ListView MyListView{get{return this.ListView1;}}

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solved How to make buttons from one form affect a listview in another one?