Asp.net modify the Registry (when the page is printed, the header, footer, margin, background color and image)

Using  System;  Using  System. Collections. Generic;  Using  System. Web;  Using  System. Web. UI;  Using  System. Web. UI. webcontrols;  Using  Microsoft. Win32;  Public   Partial   Class Printsetdefault: system. Web. UI. Page {  Protected   Void Page_load ( Object  Sender, eventargs e ){  If (Readreg () = 1  ){  If (Writereg () = 1  ) {Readreg (); response. Write (  "  Game over! "  );}}}  ///   <Summary>      ///  Read Registry  ///   </Summary>      ///   <Returns> </returns>      Protected   Int  Readreg (){  //  Read Registry Registrykey regread;  //  Read the subkeys in the HKEY_CURRENT_USER primary key. Regread = registry. currentuser. opensubkey ( "  Software \ Microsoft \ Internet Explorer \ pagesetup  " , True  );  If (Regread = Null ) //  If this subkey does not exist  {Response. Write ( "  Pagesetup: NULL </BR>  "  );  Return   0  ;}  Else  {Response. Write (  "  Pagesetup: OK </BR>  "  );  Object OBJ = regread. getvalue ( " Header  " ) = Null ? "  Null  " : Regread. getvalue ( "  Header  " ); //  Read Value Response. Write ( "  Header:  " + Obj. tostring () + " </BR>  "  ); OBJ = Regread. getvalue ( "  Footer  " ) = Null ? "  Null  " : Regread. getvalue ( "  Footer  " ); //  Read Value Response. Write ("  Footer:  " + Obj. tostring () + "  </BR>  "  ); OBJ = Regread. getvalue ( "  Margin_left  " ) = Null ? "  Null  " : Regread. getvalue ( " Margin_left  " ); //  Read Value Response. Write ( "  Margin_left:  " + Obj. tostring () + "  </BR>  "  ); OBJ = Regread. getvalue ( "  Margin_right  " ) = Null ? "  Null  " : Regread. getvalue ( "  Margin_right  " ); //  Read Value Response. Write ( "  Margin_right:  " + Obj. tostring () + "  </BR>  "  ); OBJ = Regread. getvalue ( "  Margin_top  " ) = Null ? "  Null  " : Regread. getvalue ( "  Margin_top  " ); //  Read Value Response. Write ( "  Margin_top:  " + Obj. tostring () + "  </BR>  "  ); OBJ = Regread. getvalue ( "  Margin_bottom  " ) = Null ? "  Null  " : Regread. getvalue ( "  Margin_bottom  " ); // Read Value Response. Write ( "  Margin_bottom:  " + Obj. tostring () + "  </BR>  "  ); OBJ = Regread. getvalue ( "  Print_background  " ) = Null ? "  Null  " : Regread. getvalue ( "  Print_background  " ); //  Read Value Response. Write ( "  Print_background:  " + Obj. tostring () + "  </BR>  "  ); Response. Write (  "  </BR>  " );} Regread. Close ();  Return   1  ;}  ///   <Summary>      ///  Write registry  ///   </Summary>      Protected   Int  Writereg (){  //  Write registry Registrykey regwrite;  //  Write subkeys to the primary key of HKEY_CURRENT_USER  //  If the sub-key already exists, the system will automatically overwrite it. Regwrite = registry. currentuser. createsubkey ( "  Software \ Microsoft \ Internet Explorer \ pagesetup  "  );  //  Add data items to the test subkey Regwrite. setvalue ( "  Header  " , "  & W & bpage & P of & P  "  ); Regwrite. setvalue (  "  Footer  " , "  & U & B & D  "  ); Regwrite. setvalue (  "  Margin_left  " , 0.750000 ); Regwrite. setvalue (  "  Margin_right  " , 0.750000  ); Regwrite. setvalue (  "  Margin_top  " , 0.750000  ); Regwrite. setvalue (  "  Margin_bottom  " , 0.750000 ); Regwrite. setvalue (  "  Print_background  " , "  No  "  );  //  Close this object  Regwrite. Close ();  Return   1  ;}} 

The above result is restored to the default value. You can also change it to 0.