(VB.NET) Write utf-8 CSV Compatible with Excel

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A CSV containing non-English characters that is saved using the utf-8 character encoding must include a BOM (also known as a preamble) if it is to be correctly loaded into Excel. See https://en.wikipedia.org/wiki/Byte_order_mark

This example shows how to save the CSV to a file using utf-8 with a BOM.

Note: This example requires Chilkat v9.5.0.93 or later.

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' This example program loads a file (japanese.csv)
' that contains this content:
' 
' year,color,country,food
' 2001,red,France,cheese
' 2005,blue,"United States",hamburger
' 2008,green,Italy,pasta
' 1998,orange,Japan,sushi
' 2010,silver,"",""
' 

Dim csv As New Chilkat.Csv
csv.HasColumnNames = True
Dim success As Boolean = csv.LoadFile2("qa_data/csv/test.csv","utf-8")
If (success <> True) Then
    Debug.WriteLine(csv.LastErrorText)
    Exit Sub
End If



' To save the CSV using utf-8 with a BOM/preamble, 
' add "EMIT_BOM" to the UncommonOptions.
' (This feature was added in Chilkat v9.5.0.93)

csv.UncommonOptions = "EMIT_BOM"
success = csv.SaveFile2("qa_output/test.csv","utf-8")
If (success <> True) Then
    Debug.WriteLine(csv.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("OK, try to load the CSV in Excel to see if the non-English chars are correct.")