Asp.net XML operation class

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Public class xmlcontrol
{
Protected string strxmlfile;
Protected xmldocument objxmldoc = new xmldocument ();

Public xmlcontrol (string xmlfile)
{
//
// Todo: add the constructor program code here.
//
Try
{
Objxmldoc. Load (xmlfile );
}
Catch (system. Exception ex)
{
Throw ex;
}
Strxmlfile = xmlfile;
}

Public dataview getdata (string xmlpathnode)
{
// Search for data. Returns a dataview.
Dataset DS = new dataset ();
Stringreader READ = new stringreader (objxmldoc. selectsinglenode (xmlpathnode). outerxml );
DS. readxml (read );
Return Ds. Tables [0]. defaultview;
}

Public void Replace (string xmlpathnode, string content)
{
// Update the node content.
Objxmldoc. selectsinglenode (xmlpathnode). innertext = content;
}

Public void Delete (string node)
{
// Delete a node.
String mainnode = node. substring (0, node. lastindexof ("/"));
Objxmldoc. selectsinglenode (mainnode). removechild (objxmldoc. selectsinglenode (node ));
}

Public void insertnode (string mainnode, string childnode, string element, string content)
{
// Insert a node and a subnode of the node.
Xmlnode objrootnode = objxmldoc. selectsinglenode (mainnode );
Xmlelement objchildnode = objxmldoc. createelement (childnode );
Objrootnode. appendchild (objchildnode );
Xmlelement objelement = objxmldoc. createelement (element );
Objelement. innertext = content;
Objchildnode. appendchild (objelement );
}

Public void insertelement (string mainnode, string element, string attrib, string attribcontent, string content)
{
// Insert a node with a property.
Xmlnode objnode = objxmldoc. selectsinglenode (mainnode );
Xmlelement objelement = objxmldoc. createelement (element );
Objelement. setattribute (attrib, attribcontent );
Objelement. innertext = content;
Objnode. appendchild (objelement );
}

Public void insertelement (string mainnode, string element, string content)
{
// Insert a node without attributes.
Xmlnode objnode = objxmldoc. selectsinglenode (mainnode );
Xmlelement objelement = objxmldoc. createelement (element );
Objelement. innertext = content;
Objnode. appendchild (objelement );
}

Public void save ()
{
// Save the token.
Try
{
Objxmldoc. Save (strxmlfile );
}
Catch (system. Exception ex)
{
Throw ex;
}
Objxmldoc = NULL;
}
}

========================================================== ========================

Instance application:

String strxmlfile = server. mappath ("testxml. xml ");
Xmlcontrol xmltool = new xmlcontrol (strxmlfile );

// Display data
// Dglist. datasource = xmltool. getdata ("book/authors [ISBN = \" 0002 \ "]");
// Dglist. databind ();

// Update Element Content
// Xmltool. Replace ("book/authors [ISBN = \" 0002 \ "]/content", "ppppppp ");
// Xmltool. Save ();

// Add a new node
// Xmltool. insertnode ("book", "author", "ISBN", "0004 ");
// Xmltool. insertelement ("book/author [ISBN = \" 0004 \ "]", "content", "aaaaaaaaa ");
// Xmltool. insertelement ("book/author [ISBN = \" 0004 \ "]", "title", "sex", "man", "iiiiiiii ");
// Xmltool. Save ();

// Delete all content and attributes of a specified Node
// Xmltool. Delete ("book/author [ISBN = \" 0004 \ "]");
// Xmltool. Save ();

// Delete a subnode of a specified Node
// Xmltool. Delete ("book/authors [ISBN = \" 0003 \ "]");
// Xmltool. Save ();