private void btnSubmit_Click(object sender, EventArgs e)
        {
            MongoClient        client = new MongoClient("mongodb://localhost");
            MongoServer        server = client.GetServer();
            MongoDatabase      db     = server.GetDatabase("NBA");
            MongoCursor <User> put    = db.GetCollection <User>("Users").FindAll();
            bool f = false;

            foreach (User i in put)
            {
                //checks entered username with username in database
                if (txtusername.Text.Trim() == i.username)
                {
                    f = true;
                    //take all this following values on 2nd form of forgot password
                    frmForgot_Pass2 obj = new frmForgot_Pass2();
                    obj.username = i.username;
                    obj.security = i.security;
                    obj.answer   = i.answer;
                    this.Hide();
                    obj.Show();
                    break;
                }
            }
            //if username not matches with username in database then gives error
            if (!f)
            {
                MessageBox.Show("Invalid Username!");
            }
            txtusername.Focus();
        }
        private void picBack_Click(object sender, EventArgs e)
        {
            frmForgot_Pass2 obj = new frmForgot_Pass2();

            obj.username = username;
            obj.security = security;
            obj.answer   = answer;
            this.Hide();
            obj.Show();
        }