XML ASP.Net

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<%@ Page Language="C#"%>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Xml" %>
<%@ Import Namespace="System.Xml.Schema" %>
    
    private StringBuilder stringBuilder = new StringBuilder();
    void Page_Load(object sender, EventArgs e)
    {        
        string ns = "http://www.w3.org/2001/XMLSchema";
        string xsdPath = MapPath("NewAuthors.xsd");        
        XmlSchema schema = new XmlSchema();                     
        
        XmlSchemaElement authorID = new XmlSchemaElement();
        authorID.Name = "authorID";
        authorID.SchemaTypeName = new XmlQualifiedName("string", ns );
        
        XmlSchemaElement authorLastName = new XmlSchemaElement();
        authorLastName.Name = "lastName";
        authorLastName.SchemaTypeName = new XmlQualifiedName("string", ns);
        
        XmlSchemaElement authorFirstName = new XmlSchemaElement();
        authorFirstName.Name = "firstName";
        authorFirstName.SchemaTypeName = new XmlQualifiedName("string", ns);
        
        XmlSchemaElement zip = new XmlSchemaElement();
        zip.Name = "zip";
        zip.SchemaTypeName = new XmlQualifiedName("unsignedInt", ns);
        
        XmlSchemaElement contract = new XmlSchemaElement();
        contract.Name = "contract";
        contract.SchemaTypeName = new XmlQualifiedName("boolean", ns);       
              
        XmlSchemaElement authorElement = new XmlSchemaElement();
        authorElement.Name = "author";        
                
        // Create an anonymous complex type for the author element
        XmlSchemaComplexType authorType = new XmlSchemaComplexType();
        XmlSchemaSequence authorSeq = new XmlSchemaSequence();
        //Add all the child elements to the sequence
        authorSeq.Items.Add(authorID);
        authorSeq.Items.Add(authorLastName);
        authorSeq.Items.Add(authorFirstName);
        authorSeq.Items.Add(zip);
        authorSeq.Items.Add(contract);
        authorType.Particle = authorSeq;     
           
        //Set the SchemaType of authors element to the complex type
        authorElement.SchemaType = authorType;               
        //Add the root authors element to the schema
        schema.Items.Add(authorElement);
        //Compile the file to check for validation errors
        schema.Compile(new ValidationEventHandler(ValidationEventHandler));                    
        FileStream stream = new FileStream(xsdPath, FileMode.Create);
        //Write the file
        schema.Write(stream);
        stream.Close();
        if (stringBuilder.ToString() == String.Empty)
            Response.Write("File written successfully");
        else
            Response.Write("Schema Creation Failed. 
" + stringBuilder.ToString());        
    }   
    void ValidationEventHandler(object sender, ValidationEventArgs args)
    {        
        stringBuilder.Append("Validation error: " + args.Message + "
");                
    }    
  



    Writing XSD Schema