System.Xml.Schema.XdrBuilder.SendValidationEvent C# (CSharp) Method

        private void SendValidationEvent(XmlSchemaException e, XmlSeverityType severity)
        {
            _SchemaInfo.ErrorCount++;
            if (_validationEventHandler != null)
            {
                _validationEventHandler(this, new ValidationEventArgs(e, severity));
            }
            else if (severity == XmlSeverityType.Error)
            {
                throw e;
            }
        }
    }; // class XdrBuilder

 private static void XDR_BeginAttribute(XdrBuilder builder)
 {
     if (builder._BaseDecl._TypeName.IsEmpty)
     {
         builder.SendValidationEvent("Sch_MissAttribute");
     }
     SchemaAttDef pAttdef = null;
     XmlQualifiedName name = builder._BaseDecl._TypeName;
     string ns = builder._BaseDecl._Prefix;
     if (builder._ElementDef._AttDefList != null)
     {
         pAttdef = (SchemaAttDef) builder._ElementDef._AttDefList[name];
     }
     if (pAttdef == null)
     {
         SchemaAttDef def2;
         XmlQualifiedName key = name;
         if (ns.Length == 0)
         {
             key = new XmlQualifiedName(name.Name, builder._TargetNamespace);
         }
         if (builder._SchemaInfo.AttributeDecls.TryGetValue(key, out def2))
         {
             pAttdef = def2.Clone();
             pAttdef.Name = name;
         }
         else if (ns.Length != 0)
         {
             builder.SendValidationEvent("Sch_UndeclaredAttribute", XmlQualifiedName.ToString(name.Name, ns));
         }
     }
     if (pAttdef != null)
     {
         builder.XDR_CheckAttributeDefault(builder._BaseDecl, pAttdef);
     }
     else
     {
         pAttdef = new SchemaAttDef(name, ns);
         DeclBaseInfo info = new DeclBaseInfo {
             _Checking = true,
             _Attdef = pAttdef,
             _TypeName = builder._BaseDecl._TypeName,
             _ElementDecl = builder._ElementDef._ElementDecl,
             _MinOccurs = builder._BaseDecl._MinOccurs,
             _Default = builder._BaseDecl._Default,
             _Next = builder._UndefinedAttributeTypes
         };
         builder._UndefinedAttributeTypes = info;
     }
     builder._ElementDef._ElementDecl.AddAttDef(pAttdef);
 }