ASP. NET simulated Domain Verification login and password Modification

ExampleCodeFor ASP. NET MVCProgram, For reference only!

Namespace to be referenced:

 
UsingSystem. directoryservices;
 

Login. cshtml code:

 @{
Viewbag. Title = "simulated Domain Verification ";
Layout = "~ /Views/shared/_ layout. cshtml ";
}
  <  H2  >  Simulated Domain Verification  </  H2  >  
@ Using (html. beginform ()){
  < P  >  Username: @ html. Textbox ("username ")  </  P  >  
  <  P  >  Old password: @ html. Password ("oldpassword ")  </  P  >  
  <  P >  New Password: @ html. Password ("newpassword ")  </  P  >  
  <  P  > <  Input  Type  = "Submit"  Value  = "Login"     /> </  P >  
}
@ Viewdata ["MSG"] 

CS code:

 [Acceptverbs (httpverbs. Post)]
[Validateinput (  False  )]
  Public  Actionresult login (  String  Username,  String  Oldpassword,  String  Newpassword)
{
Directoryentry ad  =    New  Directoryentry ();
Ad. Path  =     String  . Format (  "  LDAP: // {0}  "  , IPaddress );
Ad. Username  =     "  Domain  "     +    @"  \  "     +  Username;
Ad. Password  =  Oldpassword;
Ad. authenticationtype  =  Authenticationtypes. secure;

  Try  
{
Directorysearcher searcher  =     New Directorysearcher (AD );
Searcher. Filter  =  String. Format (  "  (& (Objectclass = user) (samaccountname = {0 }))  "  , Username );
System. directoryservices. searchresult result  =  Searcher. findone ();
  If  (Result  ! =     Null )
{
Directoryentry userentry  =  Result. getdirectoryentry ();
  If  (Userentry  ! =     Null  )
{
  Try  
{
Userentry. Invoke (  "  Changepassword  "  , New  Object [] {oldpassword, newpassword });
Userentry. commitchanges ();
Userentry. Close ();
Viewdata [  "  MSG  "  ]  =     "  Password Changed!  "  ;
}
  Catch  (Exception ex)
{
Viewdata [ "  MSG  "  ]  =     "  Operation failed. Error cause:  "     +  Ex. tostring ();
}
}
}
  Else  
{
Viewdata [  "  MSG "  ]  =     "  Operation failed. Unknown account or Password error!  "  ;
}
Ad. Close ();
}
  Catch  (Exception ex)
{
Viewdata [  "  MSG  "  ]  =    "  Operation failed. Error cause:  "     +  Ex. tostring ();
}

  Return  View ();
}