.NET (Core and Framework)

An unhandled exception of type 'System.AccessViolationException' occurred in System.Data.dll

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. 

        public static string ConvertXlsAndXlstToPipeDelimitedFile(string strSourceFilePath, bool isFirstRowColumnHeader, string sheetName)
        {
            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
                strSourceFilePath + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";

            OleDbConnection conn = null;
            StreamWriter wrtr = null;
            OleDbCommand cmd = null;
            OleDbDataAdapter da = null;

            string destinationFilePath = string.Empty;

            conn = new OleDbConnection(strConn);           

            try
            {
                if (conn.State != ConnectionState.Open)
                {
                    conn.Open();
                }

                cmd = new OleDbCommand("SELECT * FROM [" + sheetName + "$]", conn); //"Sheet1"
                cmd.CommandType = CommandType.Text;

                da = new OleDbDataAdapter(cmd);
                DataTable dt = new DataTable();
                da.Fill(dt);

                string strDirectory = (System.IO.Path.GetDirectoryName(strSourceFilePath));

                if (!System.IO.Directory.Exists(strDirectory))
                {
                    System.IO.Directory.CreateDirectory(strDirectory);
                }

                Path.GetFileNameWithoutExtension(strSourceFilePath);

                destinationFilePath = (strDirectory + (@"\" + (Path.GetFileNameWithoutExtension(strSourceFilePath) + ".csv")));

                wrtr = new StreamWriter(destinationFilePath);

                int ColCount = 0; string rowString = "";
                for (int y = 0; y < dt.Columns.Count; y++)
                {
                    rowString += dt.Columns[y].ColumnName + "|";

                }
                wrtr.WriteLine(rowString);

                for (int x = 0; x < dt.Rows.Count; x++)
                {
                    rowString = "";
                    for (int y = 0; y < dt.Columns.Count; y++)
                    {
                        rowString += "\"" + dt.Rows[x][y].ToString() + "\"|";
                    }
                    wrtr.WriteLine(rowString);
                }

                if (File.Exists(destinationFilePath))
                    return destinationFilePath;
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (conn != null)
                {
                    if (conn.State != ConnectionState.Closed)
                    {
                        conn.Close();
                    }
                    conn.Dispose();
                }

                if (cmd != null)
                {
                    cmd.Dispose();
                }
                if (da != null)
                {
                    da.Dispose();
                }

                if (wrtr != null)
                {
                    wrtr.Close();
                    wrtr.Dispose();
                }
            }
            //MessageBox.Show("Done");
            return string.Empty;
        }

Error: 0xC0049064 at Populate Stage, Derived Column [97]: An error occurred while attempting to perform a type cast.
Error: 0xC0209029 at Populate Stage, Derived Column [97]: SSIS Error Code DTS_E_INDUCEDTRANSFORMFAILUREONERROR.  The "Derived Column" failed because error code 0xC0049064 occurred, and the error row disposition on "Derived Column.Outputs[Derived Column Output].Columns[Payment Due Date]" specifies failure on error. An error occurred on the specified object of the specified component.  There may be error messages posted before this with more information about the failure.
Error: 0xC0047022 at Populate Stage, SSIS.Pipeline: SSIS Error Code DTS_E_PROCESSINPUTFAILED.  The ProcessInput method on component "Derived Column" (97) 
failed with error code 0xC0209029 while processing input "Derived Column Input" (98). The identified component returned an error from the ProcessInput method. 

The error is specific to the component, but the error is fatal and will cause the Data Flow task to stop running.  There may be error messages posted before this with more information about the failure.

(DT_DATE)(SUBSTRING([Date Posted],1,4) + "-" + SUBSTRING([Date Posted],5,2) + "-" + SUBSTRING([Date Posted],7,2))