We Keep Coding

data source folder on other device

we have data stored in an Excel file (Trail_Test.xls), which is stored in the Resources folder of our C# project.
now we need to load data from that xls file to dataGridView on the windows form application we have.
This is the code we use
System.Data.OleDb.OleDbConnection MyConnection;
System.Data.DataSet DtSet;
System.Data.OleDb.OleDbDataAdapter MyCommand;
string path = System.AppDomain.CurrentDomain.BaseDirectory + #"Resources\Trail_Test.xls";
MyConnection = new System.Data.OleDb.OleDbConnection(#"provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + path + "';Extended Properties=Excel 8.0;");
MyCommand = new System.Data.OleDb.OleDbDataAdapter("select * from [20$]", MyConnection);
DtSet = new System.Data.DataSet();
MyCommand.Fill(DtSet);
dataGridView1.Columns.Clear();
dataGridView1.DataSource = DtSet.Tables[0];
This gives an error on the 8th line:
The Microsoft Jet database engine could not find the object '20$'. Make sure the object exists and that you spell its name and the path name correctly.
any help ??
thanks

The path has to be relative to the executable. For example if the executable is in
C:\Users\Adham\Documents\Visual Studio 2010\Projects\Curve Fitting\Curve Fitting\
then the path to the .xls file will be
string path = System.AppDomain.CurrentDomain.BaseDirectory + #"Resources\Trail_Test.xls";
string connectionString = #"provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + path + "';Extended Properties=Excel 8.0;"

Your MyConnection object includes
Data Source='C:\Users\Adham\Documents\Visual Studio 2010\Projects\Curve Fitting\Curve Fitting\Resources\Trail_Test.xls
that looks like something that should not be hardcoded and will cause problems when executed on any other computer but Adham's.

Try this: Make sure that the file is marked as "Copy to output directory=copy if newer", just right click on it and see "properties"

you should reach the installition folder. It will depends on your project type. There is an answer to reach Resources folder for a c# project
https://stackoverflow.com/a/27182028/3209523

How can I read Excel file? [duplicate]

This question already has answers here:
Excel "External table is not in the expected format."
(25 answers)
Closed 7 years ago.
I want to read excell file with this code:
var fileName = #"d:\1.xlsx";
var connectionString = string.Format(
"Provider=Microsoft.Jet.OLEDB.4.0; data source="+fileName+
"; Extended Properties=Excel 8.0;", fileName);
var adapter = new OleDbDataAdapter("SELECT * FROM [sheet1$]", connectionString);
var ds = new DataSet();
adapter.Fill(ds, "anyNameHere");
DataTable data = ds.Tables["anyNameHere"];
But when run the program I get this error:
An unhandled exception of type 'System.Data.OleDb.OleDbException'
occurred in System.Data.dll
Additional information: External table is not in the expected format.
How can i solve that?

Your excel file is 2007 version, *.xlsx and you are using the wrong provider(Microsoft.Jet.OLEDB.4.0).
Try this approach:
var fileName = #"d:\1.xlsx";
var connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties=Excel 12.0;";

Its already answer the question in the past post Please follow the below link
Answer link
The answer is very simple
sConnection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Test.xlsx;Extended Properties=\"Excel 12.0;HDR=No;IMEX=1\"";

you have diff version of Excel file, get the file name, if its extension is .xlsx, use this
var fileName = #"d:\1.xlsx";
var connectionString = string.Format(
"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="{0}";Extended Properties=Excel 12.0;", fileName);

I would suggest this Libary called FileHelpers. Since discovering it i have never written the plumbing code myself. It lets you concentrate on the actual business logic.

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();`

Dependent Excel cells are not updated automatically

I wrote this method (almost similar in other post)
public void update(string fileName, string sheetName)
{
string connString = connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Server.MapPath(fileName) + ";Extended Properties='Excel 12.0;HDR=NO'";
try
{
OleDbConnection oledbConn = new OleDbConnection(connString);
oledbConn.Open();
OleDbCommand cmd = new OleDbCommand("UPDATE ["+sheetName+"$B5:B5] SET F1=17", oledbConn);
cmd.ExecuteNonQuery();
oledbConn.Close();
}
catch(Exception ex)
{
Debug.Write("Error: " + ex.Message);
}
}
and calling that method:
update("test.xls", "test");
So far, it works fine because when I open the test.xls file, B5 gets updated to 17. However, if there is a cell: B1 is dependent on B5: B1=B5*5, then B1 will not get updated automatically. I have to manually open the Excel file and save it with warning in order to get B1 updated. How can I do it programmatically?

I don't think that you can depend on Excel updating calculated columns when you use the ACE driver to interact with the Excel worksheet. When you are using OLEDB to operate on the workbook's worksheet, it is treating the worksheet as a database table like structure.
I think you may want to use OpenXML to read/write to the file. There are several threads on StackOverflow with more info on using OpenXML that are worth checking out.
This post shows your exactly how to force a cell re-calc using OpenXML.

ASP.NET OleDb Excel Connection to Worksheet

I have an Excel file that the customer is pulling from their financial software and uploading to my web app. I need to connect to the file through ADO and read its contents into a SQL database.
The problem is that the file that comes from the financial software is a standalone Excel Worksheet, not Workbook, so no piece of software (besides Excel) that I've found can connect to/open it. No matter what connection string I use in the OleDB connector, I can't get it to work.
If I open the file in Excel, then simply save it, I can connect and read it fine. I wrote some code to automate Excel, using the Office interop, that opens/saves the file, and it works, but I've concluded this is bad practice to do on a server, based on testing and reading.
Does anyone know of a way I can get around this problem? I've seen some third party libraries, but they are very expensive.
Thanks in advance.
HttpPostedFile jvFile = FileUpload1.PostedFile;
string jvPath = Path.Combine(Server.MapPath("~"), Path.GetFileName(jvFile.FileName));
jvFile.SaveAs(jvPath);
string[] begins = {
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=",
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=",
"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=",
"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=",
"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=",
"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=",
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=",
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
};
string[] ends = {
";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1;\"",
";Extended Properties=\"Excel 8.0;HDR=Yes;\"",
";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"",
";Extended Properties=\"Excel 12.0 Xml;HDR=YES\"",
";Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\"",
";Extended Properties=\"Excel 12.0;HDR=YES\"",
";Extended Properties=\"Excel 12.0 Macro;HDR=YES\"",
";Extended Properties=\"text;HDR=Yes;FMT=Delimited\"",
";Extended Properties=\"text;HDR=Yes;FMT=Fixed\";"
};
for(int i = 0; i < begins.Length; i++)
{
StringBuilder sbExcelFileConnStr = new StringBuilder();
sbExcelFileConnStr.Append(begins[i]);
sbExcelFileConnStr.Append(jvPath);
sbExcelFileConnStr.Append(ends[i]);
OleDbConnection dbConn = new OleDbConnection(sbExcelFileConnStr.ToString());
string[] excelSheets = { };
try
{
dbConn.Open();
}
catch (Exception ex)
{
// fails here with "System.Data.OleDb.OleDbException:
// External table is not in the expected format."
//
//
}
}
I can't put the problem file anywhere b/c it contains sensitive data.

I've used the Excel Data Reader for reading Excel files. It's free.