Operation is not valid due to the current state of the object. in C#

I had created this method to check number of this record in the table but it gives me this error message when the value of count(*) is 0 i use this library to connect oracle db

using Oracle.DataAccess.Client;

 private int checkPort(int portID)
        {
            int intCount = 0;
            try
            {
                OracleCommand oraCommand = new OracleCommand();
                oraCommand.Connection = new DBManager().getConnection();
                oraCommand.CommandText = "select count(*) as num from wireless_port_oid where port_id=:port_id";
                oraCommand.Parameters.Add(":port_id", portID);

                OracleDataReader Reader= oraCommand.ExecuteReader();


                return intCount;
                while (**Reader.Read()**)//it gives exception here
//The err Operation is not valid due to the current state of the object.
                {  
                    intCount =Convert.ToInt32(Reader[0]);
                    Reader.Close();
                    oraCommand.Connection.Close();
                    oraCommand = null;
                    if (intCount > 0)
                    {
                        return 1;
                    }
                }
                Reader.Close();
                Reader.Dispose();
                oraCommand.Connection.Close();
                oraCommand.Connection.Dispose();
                oraCommand.Dispose();
                return 0;

            }
            catch (OracleException exception)
            {
                Console.WriteLine(exception.Message);
                return 0;
            }
        }