private void Form1_Load(object sender, EventArgs e)
        {
            Form2.check = true;
        }
        public void set()
        {
          
            label1.Text = "xx";
            MessageBox.Show("xx");
           
        }

private void button1_Click(object sender, EventArgs e)
        {
            Form1 fm = new Form1();
            if (!check)
            {
                fm.Show();
            }
            else
            {
                fm.set();
               
                
            }
        }