Excel “External table is not in the expected format.”

Question:
I'm trying to read an Excel (xlsx) file using the code shown below. I get an "External table is not in the expected format."error unless I have the file already open in Excel. In other words, I have to open the file in Excel first before I can read if from my C# program. The xlsx file is on a share on our network. How can I read the file without having to open it first? Thanks
 
 

   
   
   
   
string sql = "SELECT * FROM [Sheet1$]";
string excelConnection = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathname + ";Extended Properties=/"Excel 8.0;HDR=YES;IMEX=1;/"";

using (OleDbDataAdapter adaptor = new OleDbDataAdapter(sql, excelConnection)) {
DataSet ds = new DataSet();
adaptor.Fill(ds);
}

 
 
Answers:
"External table is not in the expected format."typically occurs when trying to use an Excel 2007 file with a connection string that uses: Microsoft.Jet.OLEDB.4.0 and Extended Properties=Excel 8.0
Using the following connection string seems to fix most problems.
 
 

   
   
   
   
public static string path = @"C:/src/RedirectApplication/RedirectApplication/301s.xlsx";
public static string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;";

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