How to return values in C# with exit code?

I wrote a simple C# console application that goes into SQL and returns an integer value and message followed by a return-code. The integer value is a percentage ranging from 0 to 100%. 100% is green, if it drops below 80% I have a warning.

When I run the exe the code in command line it generates the right values. However when I add the custom EXE sensor in PRTG I have a constant value of 0 and the message is 78620d7b-087c-443f-bea3-3191c7adb254

Should be... 100:ok or 67:WARNING

My main method calls the a method that prints an integer and text to the console window. Then comes back with an exit code.

    class Program
    {
        static int Main(string[] args)
        {
            int ret = HitRatio.buffHitPer();
            return ret;                   
        }
    }

Method which grabs data from the SQL server and prints to the console window.

private static int CreateCommand(string queryString, string connectionString)
        {
            int ret=1;
            SqlConnection connection = new SqlConnection(connectionString);
            try
            {
                connection.Open();

                SqlCommand command = new SqlCommand(queryString, connection);
                SqlDataReader reader = command.ExecuteReader();
                while (reader.Read())  //PRTG is expecting a return in the format of int64:string
                {
                    if (Convert.ToInt32(reader[0]) >= 79)
                    {
                        Console.WriteLine(Convert.ToInt16(reader[0]) + ":WARNING");
                        ret = 1;
                    }
                    else if (Convert.ToInt32(reader[0]) < 79)
                    {
                        Console.WriteLine(Convert.ToInt16(reader[0]) + ":ok");
                        ret = 0;
                    }
                }
            }
            catch(Exception e)
            {
                Console.WriteLine(String.Format("0:{0}", Convert.ToString(e)));
                ret = 2;
            }
            finally
            {
                connection.Close();
            }
            return ret;
        }

c# integer return-code sql value