public   partial   class   blog   :   System.Web.UI.Page
{
        protected   void   Page_Load(object   sender,   EventArgs   e)
        {

        }
        protected   void   TextBox1_TextChanged(object   sender,   EventArgs   e)
        {

        }
        protected   void   Button1_Click(object   sender,   EventArgs   e)
        {
                //Xml1.TransformSource   =   "xsltdoc.xsl ";
                Add_diary(Server   .MapPath( "../blog.xml "),   tbxsubject.Text,   tbxcontent.Text);
        }

          public   void   Add_diary(string   filename,string   subject,string   content)
      {     if(File.Exists(filename))
          {XmlDocument   doc=new   XmlDocument();
        doc.Load(filename   );      
        XmlElement   childElem;
        childElem=doc.CreateElement( "diary ");
        XmlElement   diary_child;

        diary_child   =doc.CreateElement( "subject ");
        diary_child.InnerText=subject   ;
        childElem.AppendChild(diary_child   );

        diary_child   =doc.CreateElement( "date ");
        diary_child.InnerText=String.Format   ( "{0:yyyy-MM-ddThh:mm:ss} ",DateTime   .Now   );
        childElem.AppendChild(diary_child   );

        diary_child   =doc.CreateElement( "content ");
        diary_child.InnerText=content   ;
        childElem.AppendChild(diary_child   );

        XmlNode   node;
        node=doc.SelectSingleNode( "//diarys ");
        if(node!=null)
        {node.AppendChild(childElem   );
                doc.Save(filename);
        }

      }
          }

}