Question

I’m trying to validate a XML document I’m creating in the code before i save it. However my code always pass through the validation with no problem even when i input incorrect value on purpose. What is the problem with the code?

private XmlDocument xmlDocChanges = new XmlDocument();
   public void Validate()
   {
        xmlDocChanges.Schemas.Add("http://www.w3.org/2001/XMLSchema", "xsd/Customization.xsd");
        ValidationEventHandler eventHandler = new ValidationEventHandler(ValidationCallBack);
        xmlDocChanges.Validate(eventHandler);
   }
   public void ValidationCallBack (object sender, ValidationEventArgs args)
   {
       if(args.Severity == XmlSeverityType.Error || args.Severity == XmlSeverityType.Warning)
       {
           throw new Exception(args.Exception.Message);
       }
   } 

EDIT
Example XSD.

    <?xml version="1.0" encoding="utf-8"?>
<xs:schema
    attributeFormDefault="unqualified"
    elementFormDefault="qualified"
    xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:complexType name="FirstNode">
    <xs:annotation>
      <xs:documentation>First node</xs:documentation>
    </xs:annotation>
    <xs:attribute name="Identifier" type="xs:string" use="required" />
    <xs:attribute name="Bool" type="xs:boolean" use="optional" />
  </xs:complexType>
</xs:schema>

XML

<Customizations FormatVersion="1" xsi:noNamespaceSchemaLocation="Customization.xsd">
  <Customization>
    <Application name="App">
      <FirstNode Identifier="one" Bool="NoValue"></FirstNode>
    </Application>
  </Customization>
</Customizations>

Answer 1

I found a solution. I had to send a empty namespace parameter in the add method.

    public void Validate()
    {
        xmlDocChanges.Schemas.Add("", "xsd/Customization.xsd");
        ValidationEventHandler eventHandler = new ValidationEventHandler(ValidationCallBack);
        xmlDocChanges.Validate(eventHandler);
    }
    public void ValidationCallBack (object sender, ValidationEventArgs args)
    {
        if(args.Severity == XmlSeverityType.Error || args.Severity == XmlSeverityType.Warning)
        {
            throw new Exception(args.Message);
        }
    }