Generating a Comma-Delimited File from a DataSet

This is a pretty simple block of code. There are other ways to export a CDF, this works for me.

<%@ page language="C#" enableviewstate="false" %>
<%@ import namespace="System.Data" %>
<%@ import namespace="System.Data.SqlClient" %>
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
  String strSelected = Request.QueryString["ID"];
  DataSet dstClientList = 
    MyNameSpace.Customers.GetCustomers(strSelected );
  DataTable dt = dstClientList.Tables[0];
  System.Text.StringBuilder sbHead = new System.Text.StringBuilder();
  System.Text.StringBuilder sbBody = new System.Text.StringBuilder();
  Object[] columns;
  // Write the Column Names
  foreach (DataColumn dc in dt.Columns)
  {
    sbHead.Append(dc.ColumnName);
    sbHead.Append(",");
  }
  if (sbHead.Length > 0) sbHead.Remove(0,1).Append("\r\n"); 
 
  // Write the Data Rows
  foreach (DataRow dr in dt.Rows)
  {
    columns = dr.ItemArray;
    foreach (Object column in columns)
    {
      sbBody.Append(column.ToString());
      sbBody.Append(",");
    }
    if (sbBody.Length > 0) sbBody.Remove(sbBody.Length - 1, 1)._
      Append("\r\n");
  }
  Response.Clear ();
  Response.Buffer = true;
  Response.ContentType = "text/plain";
  Response.AddHeader ("Content-Disposition", _
    "inline;filename=cdf.txt");
  this.EnableViewState = false;
  Response.Write(sbHead.ToString());
  Response.Write(sbBody.ToString());
  Response.End ();
}
</script>

Get the above in a block that's easy to cut and paste (MSIE users should right-click and use Save Target As...), it also contains the improvements suggested in the comments. Enjoy!