Could not find installable ISAM

I have the following code :

string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\db\suc.xls; Extended Properties=""Excel 12.0;HDR=YES;""";

// Create Connection to Excel Workbook
using (OleDbConnection connection =
             new OleDbConnection(excelConnectionString))
{
    OleDbCommand command = new OleDbCommand
            ("Select * FROM [Sheet1$]", connection);

    connection.Open();

and i get the following error :

Could not find installable ISAM.

at connection.Open() . Any ideas ?

There's no 64 bit version of the Jet OLEDB drivers, so if you are running this on a 64 bit OS you might need to target x86 in your .NET application and not Any CPU:

I had the same error, but none of the suggestions above worked. In my case all I had to do was to change my connection string to this:

string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + FilePath + ";Extended Properties='Excel 12.0;IMEX=1;'";

Note the Single Quote around the Extended Properties attribute ('Excel 12.0;IMEX=1;'). Once I added those single quotes the error disappeared!

I was getting this issue trying to opening an xls file with a more recent provider. I fixed this issue by changing my extended properties from

Extended Properties="Excel 11.0;"

Extended Properties="Excel 8.0;"

I guess Excel 11 expects an xlsx style file.

ASKA

use Extended properties="\excel 8.0;

On 64-bit Windows and 64-bit Office (2010, 2013) environments, there are many reports on this error. The fix or workaround is a bit strange but seems to work for most people out there.

The "Microsoft Access Database Engine 2010 Redistributable" installation package seems the natural one to use but several reports says it does not work.

Instead, using the "2007 Office System Driver: Data Connectivity Components" seems to solve the above problem for most people.

来源：https://stackoverflow.com/questions/4214527/could-not-find-installable-isam

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