Question

I have scoured the net, and found many people asking this, yet none have fixed my answer.

I have a Connection Class, and a Method that uses that Class in a page.

DataConn.cs

public static OleDbConnection ConnectExcel()
{
    //Store the connection details as a string
    string connstr =
        String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=pricelist.xlsx;Extended Properties=Excel 12.0 Xml;HDR=YES");

    //Initialise the connection to the server using the connection string.
    OleDbConnection oledbConn = new OleDbConnection(connstr);

    //Open the connection, we do this here so we can instantly be able to use SQL commands in the code.
    oledbConn.Open();

    return oledbConn;
}

public static void DisconnectExcel()
{
    _oledbConn.Dispose();
    _oledbConn.Close();
}

And the code that calls it

protected void Page_Load(object sender, EventArgs e)
{
    // Connection String
    const string xlStr = "SELECT * FROM [Sheet2$]";

    // Create OleDbCommand object and select data from worksheet Food
    OleDbCommand cmd = new OleDbCommand(xlStr, DataConn.ConnectExcel());

    // Create new OleDbDataAdapter
    OleDbDataAdapter oleda = new OleDbDataAdapter();

    oleda.SelectCommand = cmd;

    // Create a DataSet which will hold the data extracted from the worksheet.
    DataSet ds = new DataSet();

    // Fill the DataSet from the data extracted from the worksheet.
    oleda.Fill(ds);

    // Bind the data to the GridView
    gridPricelist.DataSource = ds;
    gridPricelist.DataBind();
}

Yes I STILL get:

System.Data.OleDb.OleDbException: Could not find installable ISAM.

Can anyone please help?

Answer 1

If you use more than 1 extended property then the value tokens must be quoted, otherwise there is no way for the driver to distinguish them from the other non-extended properties in the connection string;

...Extended Properties=""Excel 8.0;IMEX=1"""

modify your connection string

String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=pricelist.xlsx;Extended Properties=""Excel 12.0 Xml;HDR=YES""");

reference:
Could not find installable ISAM