How to access one form variable in another form?

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C#

1st Form

namespace TestApp
{
    public partial class Form1 : Form
    {
        string testrun = "one";
        //public string testrun { get; set; }

        public string Name {
        get { return Name; }
            set { Name = testrun; }
        }
    }

}

here i'm Passing the testrun values to Name variable

2nd Form

private void button1_Click(object sender, EventArgs e)
        {
            Form1 f3 = new Form1();
            //f3.SomePropertyName = "hello from form2";
            textBox1.Text = f3.Name;
        }

Here i'm passing the name variable to the textbox.......

basically i want to get testrun value to the second form and display it in the 2nd form textbox.