Oledb Connection issue 16.0

Question

Oledb Connection issue 16.0

Sagar Pithadiya 6

Erron :-Framework version : v4.0.30319

The process was terminated due to unhandled exception

exception info = system.accessviolationexception

system.data.oledb.datasourcewrapper.initializeandcreatesession

system.data.oledb.oledbconnection.open()

sometimes this error occurred but sometimes work properly while trying to open oledb connection please help to identify root cause for this issue. above error not encounter in exception but itis encounter in event log as a complus error.

Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2023-12-05T07:07:51.8166667+00:00

Hi @Sagar Pithadiya ,

When working with OleDb connections in .NET, this exception might be caused by several factors:

Memory issues: Sometimes, this exception occurs due to memory problems within your application. This could be caused by bugs in your code or issues with how memory is allocated and accessed.

Driver or Provider issues: If you're using OleDb to connect to a database, the issue might be related to the specific driver or provider you're using. It could be a compatibility problem between your application and the database provider.

Concurrency issues: If multiple threads are accessing the OleDb connection simultaneously without proper synchronization, it can lead to memory access violations.

Could you pleas provide the code which can reproduce the error so that we can help you to identify the error.

Sagar Pithadiya 6

Hi @
public DataSet GetExcelData(bool isSheet, string sheetname)
        {

            System.Data.DataTable dt = null;
            DataSet oDS = null;
            DBManager dbExManager = new DBManager(DataProviderType.OleDb, objCom.ExcelConnection());
            dbExManager.Open();
            String TempFile = "";
            OleDbConnection _oleConn;
            _oleConn = (OleDbConnection)dbExManager.Connection;
            try
            {
                if (_oleConn == null) _oleConn.Open();

                // Get the data table containing the schema
                dt = _oleConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

                if (dt == null)
                {
                    return null;
                }
          
                dt.Dispose();
                dt = null;
                oDS = dbExManager.GetDataSet("Select * from [" + sheetname + "]");
               
                return oDS;
            }
            catch (Exception ex)
            {
                objErr.HandleError("Common_GetExcelData", ex.ToString());
                return null;
            }
            finally
            {
                dbExManager.Close();
            }


            return oDS;
        }

        public string ExcelConnection()
        {
            if (this.FileType == "CSV")
            {
                SheetName = System.IO.Path.GetFileName(ExcelFilename);
                ExcelFilename = System.IO.Path.GetDirectoryName(ExcelFilename);
            }

            string sOleDbProvider = Convert.ToString(GetConfigValue("OLEDB_CONNECTION_PROVIDER"));
            string sExtendedProperties = string.Empty;
            switch (Path.GetExtension(ExcelFilename).ToUpper())
            {
                case ".XLS": sExtendedProperties = "Excel 8.0;"; break;
                case ".XLSX": sExtendedProperties = "Excel 12.0 Xml;"; break;
                case ".XLSM": sExtendedProperties = "Excel 12.0 Macro;"; break;
                case ".XLSB": sExtendedProperties = "Excel 12.0;"; break;
            }

            return
               @"Provider=" + sOleDbProvider +
               @"Data Source=" + _strExcelFilename + ";" +
               @"Extended Properties=" + Convert.ToChar(34).ToString() + sExtendedProperties +
               ExcelConnectionOptions() + Convert.ToChar(34).ToString();

        }

Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2023-12-26T13:04:15.6166667+00:00

May I know if you have got any chance to check my answer? I am glad to help if you have any other questions.
Sagar Pithadiya 6 Reputation points

2023-12-27T11:54:17.73+00:00

hi @Jiachen Li-MSFT ,

Apologies for late reply was on Mandy leave.

Nope, I am still facing same issue, I have properly disposed all objects. can you please guide any other way i can figure out.

Thanks,

Sagar Pithadiya
Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2023-12-28T14:44:46.41+00:00
Hi @Sagar Pithadiya ,

Here are some other things you can check.

Check OleDb Connection Handling: Ensure that the OleDb connection is being managed properly - opened, used, and closed correctly. Your code seems to open the connection twice, once in the DBManager and then directly. You should manage the connection consistently.

Excel File Validation: Check the Excel file you are trying to read. Sometimes, file corruption or invalid formatting can lead to sporadic exceptions.

Exception Handling: Instead of returning null when an exception occurs, log the error and handle it appropriately. Returning null may mask the underlying issue, making it harder to diagnose.

Use Using Statement for Connections: Consider using the using statement for managing connections. This ensures that the connections are properly closed and disposed of even if an exception occurs.

1 answer

Your answer

Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2023-12-05T07:07:51.8166667+00:00

Hi @Sagar Pithadiya ,

When working with OleDb connections in .NET, this exception might be caused by several factors:

Memory issues: Sometimes, this exception occurs due to memory problems within your application. This could be caused by bugs in your code or issues with how memory is allocated and accessed.

Driver or Provider issues: If you're using OleDb to connect to a database, the issue might be related to the specific driver or provider you're using. It could be a compatibility problem between your application and the database provider.

Concurrency issues: If multiple threads are accessing the OleDb connection simultaneously without proper synchronization, it can lead to memory access violations.

Could you pleas provide the code which can reproduce the error so that we can help you to identify the error.
Sagar Pithadiya 6 Reputation points

2023-12-05T15:55:52.9066667+00:00

Hi @ public DataSet GetExcelData(bool isSheet, string sheetname) { System.Data.DataTable dt = null; DataSet oDS = null; DBManager dbExManager = new DBManager(DataProviderType.OleDb, objCom.ExcelConnection()); dbExManager.Open(); String TempFile = ""; OleDbConnection _oleConn; _oleConn = (OleDbConnection)dbExManager.Connection; try { if (_oleConn == null) _oleConn.Open(); // Get the data table containing the schema dt = _oleConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null); if (dt == null) { return null; } dt.Dispose(); dt = null; oDS = dbExManager.GetDataSet("Select * from [" + sheetname + "]"); return oDS; } catch (Exception ex) { objErr.HandleError("Common_GetExcelData", ex.ToString()); return null; } finally { dbExManager.Close(); } return oDS; } public string ExcelConnection() { if (this.FileType == "CSV") { SheetName = System.IO.Path.GetFileName(ExcelFilename); ExcelFilename = System.IO.Path.GetDirectoryName(ExcelFilename); } string sOleDbProvider = Convert.ToString(GetConfigValue("OLEDB_CONNECTION_PROVIDER")); string sExtendedProperties = string.Empty; switch (Path.GetExtension(ExcelFilename).ToUpper()) { case ".XLS": sExtendedProperties = "Excel 8.0;"; break; case ".XLSX": sExtendedProperties = "Excel 12.0 Xml;"; break; case ".XLSM": sExtendedProperties = "Excel 12.0 Macro;"; break; case ".XLSB": sExtendedProperties = "Excel 12.0;"; break; } return @"Provider=" + sOleDbProvider + @"Data Source=" + _strExcelFilename + ";" + @"Extended Properties=" + Convert.ToChar(34).ToString() + sExtendedProperties + ExcelConnectionOptions() + Convert.ToChar(34).ToString(); }
Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2023-12-26T13:04:15.6166667+00:00

May I know if you have got any chance to check my answer? I am glad to help if you have any other questions.
Sagar Pithadiya 6 Reputation points

2023-12-27T11:54:17.73+00:00

hi @Jiachen Li-MSFT ,

Apologies for late reply was on Mandy leave.

Nope, I am still facing same issue, I have properly disposed all objects. can you please guide any other way i can figure out.

Thanks,

Sagar Pithadiya
Jiachen Li-MSFT 34,221 Reputation points Microsoft External Staff

2023-12-28T14:44:46.41+00:00

Hi @Sagar Pithadiya ,

Here are some other things you can check.

Check OleDb Connection Handling: Ensure that the OleDb connection is being managed properly - opened, used, and closed correctly. Your code seems to open the connection twice, once in the DBManager and then directly. You should manage the connection consistently.

Excel File Validation: Check the Excel file you are trying to read. Sometimes, file corruption or invalid formatting can lead to sporadic exceptions.

Exception Handling: Instead of returning null when an exception occurs, log the error and handle it appropriately. Returning null may mask the underlying issue, making it harder to diagnose.

Use Using Statement for Connections: Consider using the using statement for managing connections. This ensures that the connections are properly closed and disposed of even if an exception occurs.

Answer 1

Jiachen Li-MSFT 34,221 Microsoft External Staff

Hi @Sagar Pithadiya ,

Ensure that all disposable objects like OleDbConnection, DataTable, and DataSet are properly disposed of. While you've disposed of the DataTable object (dt), remember to also dispose of the DataSet (oDS) after its use.

Best Regards.

Jiachen Li

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Oledb Connection issue 16.0

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