I needed to make a schema.ini that describes the columns:
private static void writeSchema(DataColumnCollection columns, string csvDir, string csvFileName)
{
FileStream fsOutput =
new FileStream(csvDir + "\\schema.ini",
FileMode.Create, FileAccess.Write);
StreamWriter srOutput = new StreamWriter(fsOutput);
srOutput.WriteLine("[" + csvFileName + "]");
int i = 1;
foreach (DataColumn item in columns)
{
srOutput.WriteLine("Col" + i + "=\"" + item.ToString() + "\" Text");
i++;
}
srOutput.Close();
fsOutput.Close();
}