private void button3_Click(object sender, EventArgs e)
        {
            RequestBloodForm uef = new RequestBloodForm("user");

            uef.Show();
            this.Hide();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            RequestBloodForm rb = new RequestBloodForm("admin");

            rb.Show();
            this.Hide();
        }