IF condition is not working

Question

 private void btnAdd_Click(object sender, EventArgs e)
        {
            if (txtAppointmentID.Text.Length > 0 && txtAppointmentNumber.Text.Length > 0 && txtPatientID.Text.Length > 0 && txtDoctorName.Text.Length > 0 && DateTimeAppointment.Text.Length > 0 && txtAppointmentDuration.Text.Length > 0 && txtAppointmentCharges.Text.Length > 0)
                if (Appointment.IsExist(txtAppointmentID.Text) || Appointment.IsExist(txtAppointmentNumber.Text) || Appointment.ISExit(txtPatientID.Text))
                {
                    MessageBox.Show("Appointment already Exist");
                }
                else
                {
                    if (Appointment.InsertAppointmentRecord(txtAppointmentID.Text , txtAppointmentNumber.Text, txtPatientID.Text, txtDoctorName.Text, DateTimeAppointment.Value, txtAppointmentDuration.Text, txtAppointmentCharges.Text))
                    {
                        MessageBox.Show("Appointment Record Inserted Successfully" , "Insertion Succeeded");
                        GetAppointmentTable();

                    }
                    else
                    {
                        MessageBox.Show("Appointment Record Insertion Failed" , "Insertion Failed");
                    }
                }
            else
            {
                MessageBox.Show( "Fill Required Field" , "Empty Fields");
 

 

 

 

 

I am writing this code but the condition only checked on AppointmentID however it is primary key. what can I write so it can check the complete condition?

 

2nd I want to write such like code that if AppointmentNumber and personID is insert in current day mean if entered 23/4/2015 date and record is present then show "Record Exist" if I entered next day 24/4/2015 then record insert if appointmentnumber already exists.