Find the way to check in with count [ difficult ]

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C#

Could you please help me to get a solution to my issue. I am using a SQL Server database, it is a gymnastics program, and I want to get check in the client when he comes to the gym , I have two way of offering the first one is a monthly way , and the second is a daily, the first I don't have a problem with it and I use this code for checkin;

using (SqlCommand com = new SqlCommand("select count(*)from enddate where ID=@ID and startdate <=@C1 and endDate >=@C2", con))
                {

                    com.Parameters.AddWithValue("@ID", ID.Text);
                    com.Parameters.AddWithValue("@C1", DateTime.Now);
                    com.Parameters.AddWithValue("@C2", DateTime.Now);

                    int count = (int)com.ExecuteScalar();
                    if (count > 0)
                    {
                        using (SqlCommand com1 = new SqlCommand("INSERT INTO [checkin] (ID,time,username) VALUES (@ID,@time,@username)", con))
                        {
                            com1.Parameters.AddWithValue("@ID", ID.Text);

                            com1.Parameters.AddWithValue("@time", txttime.Text);

                            com1.Parameters.AddWithValue("@username", txtusername.Text);
                            com1.ExecuteNonQuery();
                        }
                        MetroFramework.MetroMessageBox.Show(this, "Check In Sucssesfuly ................... ", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    else
                    {
                        MetroFramework.MetroMessageBox.Show(this, "this ID Expired .....................", "Message", MessageBoxButtons.OK, MessageBoxIcon.Warning);


                    }
                    con.Close();
                }

I want to add to this code the second condition ( the daily offer ) I have the enddate table like ;

| ID | Startdate | month | day | enddate |          offer       |
| 1  | 20-3-2019 |   3   |null |20-6-2019|( summer ) monthly    |
| 2  | 20-3-2019 | null  | 5   |20-3-2019|( student )  daily    |

in this case, the first one can come anytime for 3 months, in the second ID he can come for 5 times only.

my checkin table ;

| ID |   Time   | username |
| 1  | 21-3-2019| test     |
| 1  | 25-3-2019| test     |
| 2  | 27-3-2019| test 2   | 

I can count how many time he comes to the gym but I don't know how to add it in my code

What I have tried:

<pre>var goodForVisit = false;
        int visitedCount;
        int offerDayCount;
        var endDate = DateTime.MinValue;
        DateTime startDate = DateTime.MinValue;
        using (SqlConnection con = new SqlConnection("Data Source=SQL5037.site4now.net;Initial Catalog=DB_A448D1_Dragon;User Id=**********;Password=************"))
        {
            con.Open();
            //try
            //{
                using (SqlCommand com = new SqlCommand("select * from [enddate] where ID=@ID", con))
                {
                    com.Parameters.AddWithValue("@ID", ID.Text);
                    using (SqlDataReader reader = com.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            //get information from enddate table
                            var offer = reader["offer"].ToString();
                             if (reader["day"] != null)
              offerDayCount = (int)reader["day"];
                            startDate = (DateTime)reader["StartDate"];
                            if (reader["endDate"] != null)
                                endDate = (DateTime)reader["endDate"];


                            if (reader["month"] == null && offer != null)
                            {
                                endDate = DateTime.Now.Date;
                            }

                            //count the visit from checkin table
                            using (var com2 = new SqlCommand("SELECT COUNT(*) as count From checkin WHERE time >= @STARTDATE and (time <= @ENDDATE)"))
                            {
                                com2.Parameters.AddWithValue("@STARTDATE", startDate);
                                com2.Parameters.AddWithValue("@ENDDATE", endDate);

                                using (SqlDataReader reader2 = com2.ExecuteReader())
                                {
                                    if (reader2.Read())
                                    {
                                        visitedCount = (int)reader2["count"];
                                        if (offer != null && visitedCount < offerDayCount)
                                            goodForVisit = true;

                                        if (offer != null && DateTime.Now >= startDate && DateTime.Now <= endDate)
                                            goodForVisit = true;
                                    }
                                }
                            }
                        }
                    }
                }

                if (goodForVisit)
                {
                    using (SqlCommand com1 = new SqlCommand("INSERT INTO [checkin] (ID,time,username) VALUES (@ID,@time,@username)", con))
                    {
                        com1.Parameters.AddWithValue("@ID", ID.Text);

                        com1.Parameters.AddWithValue("@time", txttime.Text);

                        com1.Parameters.AddWithValue("@username", txtusername.Text);
                        com1.ExecuteNonQuery();
                    }
                    MetroFramework.MetroMessageBox.Show(this, "Check In Sucssesfuly ................... ", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    MetroFramework.MetroMessageBox.Show(this, "this ID Expired .....................", "Message", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }