Validation Error when Schema with Entities

[Nadeeka]

Hi, I wrote a Schema Validator in C#.NET.

            XmlTextReader R = new XmlTextReader(FileToParse);
            XmlValidatingReader V = new XmlValidatingReader(R);
            try
            {
                XmlSchemaCollection xsc = new XmlSchemaCollection();
                xsc.Add("", SchemaFile);
                V.Schemas.Add(xsc);
                V.EntityHandling = EntityHandling.ExpandEntities;
                V.ValidationEventHandler += new ValidationEventHandler(ShowValidationErrors);
                while (V.Read())
                {
                }
                //V.Close();
                //MessageBox.Show("Validation Completed");
                //R.Close(); 
            }
            catch (XmlException xe)
            {
                //Display exceptions
            }
            catch (XmlSchemaException xse)
            {
                //Display exceptions
            }
            catch (Exception ee)
            {
                //Display exceptions
            }
            finally
            {
                V.Close();
                MessageBox.Show("Validation Completed");
            }
 

This works fine if the xml file DOES NOT contain entity declarations.

But, If the xml file contains any entity declaration (as below), the 'ValidationEventHandler' throws errors like
"Validation Error: The 'mytest' element is not declared.Line : 8 Position : 2"
"Validation Error: The 'articles' element is not declared.Line : 9 Position : 2", etc.....

How do I overcome this in C#.NET

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE mytest
[
<!ENTITY a '<popup pos="ABBR.A"><i>a</i>.</popup>'>
<!ENTITY adv '<popup pos="ABBR.ADV"><i>adv</i>.</popup>'>

]>
<mytest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="X:\Schema\content.x sd">