通过使用OleDb操作Oracle数据库，成功实现图片上传到Blob类型的字段，但有时会发生ORA-01036错误的问题，经查询是错误提示为illegal variable name/number，不知道有谁能详细解释illegal variable name/number的意思

Oracle Data Provider for .NETHiI am using ODP.NET (Oracle Data Provider for .NET) in my asp.net application.I have a table in my oracle database called "equipmentgroup". When the page loads for the first time i retrieve all the records from the table to a dataset and save it to viewstate. Later on any addition or modification is done in the dataset only in disconnected mode. Finally,when user clicks update i call this function "update" which should do a batch update but instead it gives the following error :"ORA-01036: illegal variable name/number "        private void update()        {            OracleParameter workParam;            OracleConnection cnn = new OracleConnection("Data Source=NEELESHR;User Id=tmse; Password=tmse;");            string sql = "INSERT INTO EquipmentGroup (Code, Description, LifeTime, PriamryLife, Grading, Inflator, ExtensionRate, MaintenanceFee) VALUES (:Code, :Description, :LifeTime, :PriamryLife, :Grading, :Inflator, :ExtensionRate, :MaintenanceFee)";            OracleCommand cmd = new OracleCommand(sql,cnn);            cmd.CommandType = CommandType.Text;                        OracleDataAdapter da = new OracleDataAdapter();            da.InsertCommand = cmd;                        workParam = da.InsertCommand.Parameters.Add("Code",OracleType.Char,10,"Code");            workParam.SourceVersion = DataRowVersion.Current;            workParam = da.InsertCommand.Parameters.Add("Description",OracleType.VarChar,50,"Description");            workParam.SourceVersion = DataRowVersion.Current;            workParam = da.InsertCommand.Parameters.Add("LifeTime",OracleType.Number);            workParam.SourceColumn = "LifeTime";            workParam.SourceVersion = DataRowVersion.Current;            workParam = da.InsertCommand.Parameters.Add("PriamryLife",OracleType.Number);            workParam.SourceColumn = "PriamryLife";            workParam.SourceVersion = DataRowVersion.Current;            workParam = da.InsertCommand.Parameters.Add("Grading",OracleType.Char,10,"Grading");            workParam.SourceVersion = DataRowVersion.Current;            workParam = da.InsertCommand.Parameters.Add("Inflator",OracleType.Number);            workParam.SourceColumn = "Inflator";            workParam.SourceVersion = DataRowVersion.Current;            workParam = da.InsertCommand.Parameters.Add("ExtensionRate",OracleType.Number);            workParam.SourceColumn = "ExtensionRate";            workParam.SourceVersion = DataRowVersion.Current;            workParam = da.InsertCommand.Parameters.Add("MaintenanceFee",OracleType.Number);            workParam.SourceColumn = "MaintenanceFee";            workParam.SourceVersion = DataRowVersion.Current;                        try            {                da.Update(ds,"EquipmentGroup");            }            catch(Exception e)            {                Message.Text = e.Message;            }        }