private static int GetProjectID(OleDbConnection oleConnection, OleDbTransaction oleTransaction, ClientClass Client, int WorkerID)
        {
            int iResult = int.MinValue;

            string strSQL = @"
                                declare
                                    result1 number := null;
                                begin 
                                    result1 := DATAMART_PKG.GET_PROJECT_NAME ( 1, 2);
                                end;
                            ";

            OleDbCommand oleCommand = null;
            try
            {
                oleCommand = new OleDbCommand(strSQL, oleConnection); /* !!! НЕ РАБОТАЕТ !!!*/
                
                if (oleTransaction != null)
                {
                    oleCommand.Transaction = oleTransaction;
                }
                object obj = oleCommand.ExecuteNonQuery(); /*СЮДА БЫ РЕЗУЛЬТАТ ПОЛУЧИТЬ !!!*/
                
                int tmpProjectID;
                if ((obj != null) && (Int32.TryParse(obj.ToString(), out tmpProjectID) == true))
                {
                    /// случай заболевания был найден
                    iResult = tmpProjectID;
                }
                else
                {
                    /// случай заболевания не был найден ... надо его создать
                    ...
                    iResult = ...;
                }
            }
            catch (Exception exc)
            {
                iResult = int.MinValue;
            }

            return iResult; 
        }

string strSQL = @"
                            begin
                                HOSPITAL_.DATAMART_PKG.GET_PROJECT_NAME ( ?, ?, ?);
                            end;
                            ";

....

OleDbCommand oleCommand = null;
            try
            {
                oleCommand = new OleDbCommand(strSQL, oleConnection);
                oleCommand.CommandType = CommandType.Text;

                OleDbParameter param1 = new OleDbParameter("var1", 1068257);
                oleCommand.Parameters.Add(param1);

                OleDbParameter param2 = new OleDbParameter("var2", 11636);
                oleCommand.Parameters.Add(param2);

                OleDbParameter param3 = new OleDbParameter("var3", 10);
                param3.Direction = ParameterDirection.InputOutput;
                oleCommand.Parameters.Add(param3);

                if (oleTransaction != null)
                {
                    oleCommand.Transaction = oleTransaction;
                }
                oleCommand.ExecuteNonQuery();
                
                object obj = null;
                if (oleCommand.Parameters != null && oleCommand.Parameters["var3"] != null)
                {
                    obj = oleCommand.Parameters["var3"].Value;

                    if (obj == null || int.TryParse(obj.ToString(), out iResult) == false)
                    {
                        throw new Exception("Ошибка при создании записи!!!");
                    }
                }
                else
                {
                    throw new Exception("Ошибка при создании записи!!!");
                }
                /// iResult = int.MinValue;
                
            }