Remove header in CSV file

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C#

Hi, i have the following codes which will save all the records in datatable into a csv file. But when the records are saved, it will also include the header into the csv file. How can i remove the header from the csv file? Below are my codes:

string targetDes = TargetFolder + "1000101_20100203_192220_Employee_Transfer_Import_36" + ".csv";
StringBuilder sb = new StringBuilder();
IEnumerable<string> columnNames = dt.Columns.Cast<DataColumn>().Select(column => column.ColumnName);
sb.AppendLine(string.Join(",", columnNames));

foreach (DataRow row in dt.Rows)
{
    IEnumerable<string> fields = row.ItemArray.Select(field => field.ToString());
    sb.AppendLine(string.Join(",", fields));
}
File.WriteAllText(targetDes, sb.ToString());