How can I get CSV file encoding UTF-8 in C#.Net?

Question

I wanna make CSV file encoding UTF-8. Now, my CSV file cannot show Japanese Fonts. I want C# code to solve this problem.

Answer 1

 StringBuilder sb = new StringBuilder();          


 var columnNames = dt.Columns.Cast().Select(column => column.ColumnName).ToArray();
 sb.AppendLine(string.Join(",", columnNames));

 foreach (DataRow row in dt.Rows)
 {
     var fields = row.ItemArray.Select(field => field.ToString()).ToArray();
     sb.AppendLine(string.Join(",", fields));
 }

 File.WriteAllText(fileName, sb.ToString(), Encoding.UTF8);