Question

I would like to know how to read a csv file which has been uploaded by a control. Ive tried using OLEDB, but i get an exception. Something about that the file is read-only. Any help is appreciated. Thanks

Answer 1

You could try the FileHelpers library.
Here is an example of usage with a FileUpload control:

[DelimitedRecord(",")]  // comma separated values
[IgnoreFirst(1)]        // first line is assumed to be the header
[IgnoreEmptyLines]      // ignore empty lines
class MyClass {

    [FieldTrim(TrimMode.Both)]
    [FieldQuoted('"', QuoteMode.OptionalForBoth)]
    public string FirstName;

    [FieldTrim(TrimMode.Both)]
    [FieldQuoted('"', QuoteMode.OptionalForBoth)]
    public string LastName;
}

protected void Button1_Click(object sender, EventArgs e) {
    if (!FileUpload1.HasFile) {
        // No CSV file selected
        return
    }
    using (StreamReader sr = new StreamReader(FileUpload1.PostedFile.InputStream)) {
        FileHelperEngine engine = new FileHelperEngine(typeof(MyClass));
        foreach (MyClass entry in engine.ReadStream(sr)) {
            // do something
        }
    }
}