Converting Datatable to xml string and viceversa

Converting Datatable to xml string

show code sample here

private static string ConvertDataTableToXML(DataTable dtBuildSQL)
   {
       DataSet dsBuildSQL = new DataSet();
       StringBuilder sbSQL;
       StringWriter swSQL;
       string XMLformat;

       sbSQL = new StringBuilder();
       swSQL = new StringWriter(sbSQL);
       dsBuildSQL.Merge(dtBuildSQL, true, MissingSchemaAction.AddWithKey);
       dsBuildSQL.Tables[0].TableName = "Table";
       foreach (DataColumn col in dsBuildSQL.Tables[0].Columns)
       {
           col.ColumnMapping = MappingType.Attribute;
       }
       dsBuildSQL.WriteXml(swSQL, XmlWriteMode.WriteSchema);
       XMLformat = sbSQL.ToString();
       return XMLformat;
   }
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