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OleDbDataAdapter Peculiarity

OleDbDataAdapter Peculiarity

OleDbDataAdapter Peculiarity

In an attempt to learn something about DataGrid usage, I'm using an OleDbConnection to an Excel, (2003), spreadsheet to retrieve data. Everything works perfectly - except for one column!


string dtaFile = "d:\\d1\\d2\\s1.xls";
string cmdSQL = "select * from [Sheet 1$] where F16='NP'";
System.Data.OleDb.OleDbConnection cnXL;
System.Data.OleDb.OleDbDataAdapter cmXL;
System.Data.DataSet DtSet;
cnXL = new System.Data.OleDb.OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + dtaFile + "';Extended Properties=Excel 8.0;");
cmXL = new System.Data.OleDb.OleDbDataAdapter(cmdSQL, cnXL);
DtSet = new System.Data.DataSet();

The problem lies in F14. As output by the software that creates the workbook: Row(2) contains a date, Row(3) contains a time, and Row(4) contains "Page: ..". DtSet.GetXml() shows that F14's type is String.

cmdSQL selects data beginning with Row(9); beginning with that row, F14 contains an integer - but the resulting DataGrid shows an empty column for F14!

To test the return values, I created a method to iterate through the rows in the DataSet, and found that F14, (DataRow.ItemArray.GetValue(13).ToString()), was being returned as an empty string.

I have found a work-around, (move any two, or all three, of rows(2..4) to F15), but I don't understand the cause for this situation.

Any enlightenment would be greatly appreciated.

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