From my a VFP7 COM component, I have passed an XML string created from a cursor with
= CURSORTOXML("cResult","lcXMLResult",1,0,0,"1")

If a date field in the cursor is blank, I get an error when I load the XML into a dataset using ReadXML in my asp.net page. Code is:

lcXML = oClinserv.GetRecord(lnParentID);
loStream = new StringReader(lcXML);
loXmlTextReader = new XmlTextReader(loStream);
dsClinserv.ReadXml(loXmlTextReader,XmlReadMode.ReadSchema);	

Error message is "String was not recognized as a valid DateTime." How can I prevent this error from happening and allow the XML string to be read into the dataset?