how to iterate xml element using foreach loop

iam doing like this but int that code every table i create one element .....so using looping concept automatically created...that code i want can u tell me example of that code........
string strJson = string.Empty; //string
string strjson1 = string.Empty;
stringjson json = new stringjson(); //converted datatable to string
properties_employeepayment emppayments = new properties_employeepayment();

abs_DAL_payhistory history = new abs_DAL_payhistory();
DataSet ds = history.paymenthistory(emppayments);
DataTable dt = ds.Tables[0];
DataTable dt1 = ds.Tables[1];

if (dt.Rows.Count > 0)
{
strJson = json.json_string(dt);
}

if (dt1.Rows.Count > 0)
{
strjson1 = json.json_string(dt1);
}
XmlDocument xmlDoc = new XmlDocument(); //iam creating 3 xml elements and added that strings
XmlElement element = xmlDoc.CreateElement("data");
XmlElement Paiddata = xmlDoc.CreateElement("getpaiddata");
XmlElement Unpaiddata = xmlDoc.CreateElement("getunpaiddata");
Paiddata.InnerText = strJson;
Unpaiddata.InnerText = strjson1;
element.AppendChild(Paiddata);
element.AppendChild(Unpaiddata);
xmlDoc.AppendChild(element);

StringWriter sw = new StringWriter();
XmlTextWriter xw = new XmlTextWriter(sw);
xmlDoc.WriteTo(xw);