Here is the code -
foreach (DataTable table in Ds.Tables)
{
foreach (DataRow row in table.Rows)
{
ID_Queue=ID_Queue+1;
CSVData=String.Concat("Field1,Field2,Field3,Field4,Field5",Environment.NewLine);
CSVData=String.Concat(CSVData, row[0].ToString(),",", row[1].ToString(),",", row[2].ToString(),",", row[3].ToString(),",", row[4].ToString());
System.IO.StreamWriter file = new System.IO.StreamWriter(String.Concat("CSV",ID_Queue.ToString(),".csv"));
file.WriteLine(CSVData);
file.Close();
}
}