i have created two winforms ,first from take a value and pass it into the second form and display on a label, but when i run the programme it throws exception

form 1

private void button1_Click(object sender, EventArgs e)
              Form2 fm2 = new Form2(this.txtName.Text);

form 2

Form2 Constructor

public Form2(string parm)
            this.label1.Text = parm;
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