I'm reading an Excel file with OLDB Connection using this code
var connectionString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0; data source={0}; Extended Properties=Excel 8.0;", fileName);
var fileName = string.Format("{0}\\s23.xls", Directory.GetCurrentDirectory());
var adapter = new OleDbDataAdapter("SELECT * FROM [TEJ3$] ", connectionString);
DataTable dt=new DataTable();
adapter.Fill(dt, "Table1");
and after runing this code my data table is filled. But I have a column that has many string cells and few empty cells ; in excel file this cells have numeric values.
Someone has an idea?
Check the first examples here: http://www.connectionstrings.com/excel
What often goes wrong is that Excel will estimate the type of a column based upon the first X rows. When after that the values don't match, these rows get empty values. I'm afraid that going into the registry is sometime the only way to get the Excel driver to scan all rows first (as described in the connectionstrings.com article).
Play around with the HDR and IMEX settings in your environment. In some cases that will help as well.
I had this exact problem and solve it with using IMEX setting. In case others are wondering how to include the IMEX, here is what I have on my connection string
string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties='Excel 8.0;IMEX=1';Data Source={0};";
connectionString = string.Format(connectionString, excelWorkbookPath);
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Just make sure that your excel file is not open. Close your excel application & then start your program.
Sunil
