We Keep Coding

Is it possible to use OLEDB to read text from an excel file that contains images?

I can currently read excel files that contain only text using the OLEDB approach. However, I now need to read files that contain images. I still only require the text/numeric values from the file. I receive an error when opening the OleDbConnection.
So the connection string I am using is the following:
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=filename.xlsx;Extended Properties="Excel 12.0;HDR=NO;IMEX=1;TypeGuessRows=0;
System.Data.OleDb.OleDbException: 'External table is not in the expected format.'
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
conn.Open();
using (OleDbCommand cmd = new OleDbCommand(GetSQLCommandString(conn, sheetName), conn))
{
using (OleDbDataAdapter adapter = new OleDbDataAdapter(cmd))
{
adapter.Fill(dt);
}
}
}
return dt.AsEnumerable()
.Select(r => new Row(r));
So it fails with that error, but once I remove the images it works as expected.
Should I be looking to solutions such as OPEN XML, or is there a way I can alter my OleDb approach to work?

C# Bulk Copy via OleDBDataReader from large excel file throwing out of memory exception

I have a large excel file(530K Rows with a lot of columns). Ends up being 247MB in .xlsb format. I am attempting to import to SQL Server using BulkCopy in C#, however I am having issues where the datareader ends up running out of memory before it even starts reading the file once I run the ExecuteReader() command.
string exlConnString = $"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={_filepath};Extended Properties=\"Excel 12.0;HDR=YES;\"";
string sqlQuery = $"SELECT * FROM [{SheetName}]";
using OleDbConnection conn = new OleDbConnection(_connstring)) {
OleDbCommand exlCmd = new OleDbCommand(sqlQuery, conn)
conn.Open();
OleDbDataReader dr = exlcmd.ExecuteReader(); <---NEVER GETS PAST THIS LINE BEFORE RUNNING OUT OF MEMORY.
SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnString);
bulkCopy.DestinationTable = TableName;
while(dr.Read()) {
bulkcopy.WriteToServer(dr);
}
dr.Close();
}
I am running in x86 mode because I was geting an error that the ACE Database was not installed on my local machine and corporate policy restrictions prevent me from downloading and installing the needed file to run it in x64 mode.
The code works perfectly fine when I test it on smaller files, but not when I test it on this bigger file, so it definitely is the filesize causing the issue. Any suggestions or help would be appreciated. Doesn't make much sense that a bulk copy runs out of memory when it is meant for handling large sets of data, which also means that the filesize is going to be large as well...
And yes, I know I SHOULD be able to import this using OPENROWSET or OPENDATASOURCE in SQL Server but THAT is ALSO Turned off and they will not enable it, so this is not an option.

So your problem is next.
When you try to ExecuteReader DataReader attempt to read all data from your excel file to memory. You could think about this, like a speciality working with excel through a OleDbProvider.
So my suggestion is to work with csv files instead of excel, because with csv file you have an ability to read and parse them line by line. For this aim i would recommend you to use CSV helper

Refer this code..
Here dtExcelData is datatable variable & da is OleDbDataAdapter variable.
string excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={_filepath};Extended Properties='Excel 12.0;HDR=YES';";
// Create Connection to Excel Workbook
using (OleDbConnection connection = new OleDbConnection(excelConnectionString))
{
connection.Open();
da = new OleDbDataAdapter("Select * FROM [Sheet1$]", connection);
da.Fill(dtExcelData);
//store data in sql server database table
// below connection string "conString" is I mention in app.config file.(sql server connection string to store data in sql server database)
string str = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
using (SqlConnection con = new SqlConnection(str))
{
// Bulk Copy to SQL Server
using (SqlBulkCopy bulkCopy = new SqlBulkCopy(con))
{
bulkCopy.DestinationTableName = "TableName";
con.Open();
bulkCopy.WriteToServer(dtExcelData);
con.Close();
}
}
connection.Close();
}
Mark it as a answer if it is useful to you. :)

System.Data.OleDb.OleDbException: System resource exceeded

I am getting this issue while trying to read data from an excel file using OleDb.
This is working fine on my test server (Window Server 2008) but not working in UAT server with the same configuration.
It used to work on the UAT server, but suddenly stopped working.
I tried solutions from these sources, but nothing worked:
Intermittent "System resource exceeded" exception for OleDB connection to Microsoft Access data file
OleDbException System Resources Exceeded
System resource exceeded
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand())
{
using (OleDbDataAdapter dataAdapter = new OleDbDataAdapter())
{
cmd.Connection = conn;
//Fetch 1st Sheet Name
//conn.Open();
DataTable dtSchema;
dtSchema = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
string ExcelSheetName = dtSchema.Rows[0]["TABLE_NAME"].ToString();
//conn.Close();
////Read all data of fetched Sheet to a Data Table
//conn.Open();
cmd.CommandText = "SELECT * From [" + ExcelSheetName + "] Where (F3 = 'Reconstructive' OR F3 = 'Neurovascular' OR F3 = 'Orthobiologics') AND F2 = '"+ SterileProduct.CatalogNumber +"'";
dataAdapter.SelectCommand = cmd;
dataAdapter.Fill(dt);
}
}
}
Any help would be appreciated.
Thanks

Hope this will be helpful for others.
I went through numerous resource regarding this issue and found many solutions -programmatically and configuration based answers, unfortunately, none of the solutions worked for me and finally, i decided to use CSV file instead excel.
everything is working fine now.
Let me know if anybody found any answer to this question.
Thanks

xlsx file upload not working correctly - works when file is open but not when closed

I've been doing research on this problem for about a day and a half and haven't found a solution to my problem yet. This is my scenario:
I have a AsyncFileUpload and a button which is configured to accept only xls and xlsx files (Excel) file. This file that is uploaded is used to import information into a gridview. The old format xls files works fine. The problem comes when I want to upload the xlsx file. I've tested multiple scenarios and I have found that it works perfectly when the xlsx file is currectly/actively open. When it is closed it gives me errors. I have fiddled and explored solutions to this problem and the range of errors I have received is quite large. But the most prominent errors where the following:
1. External table is not in the expected format.
2. could-not-find-installable-isam
I have found an article relating to the second error (Could not find installable ISAM) but I haven't tried all the suggested solutions yet because I would rather avoid making changes to the windows registry because I do not have exstensive knowledge regarding this matter.
I'm attaching the code that I use to make the connection between the OleDb and the excel file:
protected void AsyncUpload_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
string connString = "";
string strFileType = Path.GetExtension(e.FileName).ToLower();
string path = e.FileName;
////Connection String to Excel Workbook
if (strFileType.Trim() == ".xls")
{
connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
}
else if (strFileType.Trim() == ".xlsx")
{
connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;HDR=Yes;IMEX=1";
}
string query = "SELECT * FROM [sheet1$]";
OleDbConnection conn = new OleDbConnection(connString);
if (conn.State == ConnectionState.Closed)
conn.Open();
OleDbCommand cmd = new OleDbCommand(query, conn);
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
using (OleDbDataReader dr = cmd.ExecuteReader())
{
_InsertWrapper.clearLists();
while (dr.Read())
{
var row1Col0 = dr[0];
Console.WriteLine(row1Col0);
_InsertWrapper.GenerateList(dr);
}
}
da.Dispose();
conn.Close();
conn.Dispose();
InventoryGrid.DataBind();
ErrorsGrid.DataBind();
}
If someone has additional knowledge or an explanation that can contribute please add it so that more people that are struggling with the same type of problem can gain as much information from this question as possible.We are all still learning.
So, main idea: Need to find a solution to successfully upload the xlsx file

Try using third party tools. They work efficiently:
http://code.google.com/p/excellibrary/

Updating data in to a Excel sheet using c#

I am trying to update some data in an Excel sheet of the format "xlsx" using OLEDB connection, but I am unable to make out the connection establishment.
Here is my code:
String sConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source='" + "D:\abc1.xlsx" + "';Extended Properties='Excel 8.0;HDR=Yes'";
OleDbConnection con = new OleDbConnection(sConnectionString);
con.Open();
OleDbCommand com = new OleDbCommand("select * from Sheet1",con);
OleDbDataReader reader = null;
reader = com.ExecuteReader();
while (reader.Read())
{
Console.WriteLine(reader[0]);
}
con.Open();
Console.ReadLine();
}
When I run the code, I'm facing the following exception:
The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local
machine.
Any idea how to recover from this exception or any other suggestions from which i can update my data in excel is advisable.

This could be the provider you have stated try changing it to the one which matches the Excel version on your machine
Try
Provider=Microsoft.ACE.OLEDB.12.0;Data Source='D:\abc1.xlsx';Extended Properties="Excel 12.0 Xml;HDR=YES";
Instead
Could also be that excel isnt installed
Also check that you have referenced the OLEDB library for your project

Change your PlatformTarget Type from AnyCPU to X86.
Steps:
Goto Project Properties.
Select Build tab.
Select X86 from PlatformTarget options.

It is possible that there are multiple reasons for this exception.
1) You could use the OleDbEnumerator class to find out what providers are available.
Accordingly you set your connection string.
2) Before that just try out below connection string.
String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + "D:\abc1.xlsx" + "';Extended Properties='Excel 8.0;HDR=Yes'";
3) If you have a 64 bit OS, there is no 64-bit version of the JET provider available and there's no alternative. As long as you want to support JET, you'll need to set the build target to x86.

first save as your excel workbook as Excel 97-2003 Workbook
It will work in my project...
string filepath = Server.MapPath("~/ImportData/") + fileUpload.FileName;
OleDbConnection oconn = new OleDbConnection
(#"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";
Extended Properties=Excel 8.0");`
oconn.Open();
OleDbDataAdapter adp = new OleDbDataAdapter("select * from Sheet1", oconn);
DataSet ds = new DataSet();
adp.Fill(ds);
oconn.Close();`