So, I've been writing a little app to combine some Excel spreadsheets. These sheets all have header rows, so I can open them up with an OleDbConnection, do a "SELECT * FROM [Sheet1$]" and go along my merry way. The problem is, two of the columns I need to work with just aren't there. They're on the excel sheet just fine, but my OleDbDataReader finds nothing in those columns on any row. Looking at the sheet, I see that in those columns, there isn't any data for about 12 rows. So, I put in zeros at the top of those columns, and then it works fine.
Is the OleDbConnection really making assumptions about the dataset based on the first row? After much googling and little success, I try to find a definition of the connectionstring, hoping there's some attribute like "rows to scan for schema" I can set, to tell it to actually read my data. Nathan points me to an excellent resource, Connectionstrings.com, and they kindly let me know that I can specify HDR=Yes; to indicate that I have a header row in my sheets, and IMEX=1; which, according to Connectionstrings.com: tells the driver to always read "intermixed" data columns as text. More...