private void button1_Click(object sender, EventArgs e)
{
UC_Appointments app = new UC_Appointments();
this.Controls.Clear();
this.Controls.Add(app);
}
private void btnAppointments_Click(object sender, EventArgs e)
{
mainPanel.Controls.Clear();
UC_Appointments app = new UC_Appointments();
mainPanel.Controls.Add(app);
}