XML Parsing Error: no element found

Recently when I am working with web service which returns data as XML format. But unfortunately I always found that the page always show error : XML Parsing Error: no element found. Error does not contain specific information about the source of error.

Problem:
The common reason for XML Parsing Error: no element found is missing closing tag for one or two html element, so I checked whole xml docs several times to make sure not miss any start and closing( or ) tags.

Solution:
After searching for while I found that somehow ASP.NET treat the response of page as XML document and that’s why we receive XML Parsing Error: no element found error.
To solve this error I added a line

Response.ContentType = "text/HTML" 

to .cs page. This line tells ASP.NET runtime that response is HTML text and not XML.