Cloud Computing

I'm new to the subject of  CloudSim and I've run some of the existing examples in the CloudSim package (the 8 existing examples...).   
I want to implement an optimal SFC allocation scenario with CloudSim. This scenario will include definition of cost function to allocate the  virtual network functions (included in the service function chain) optimally on the network nodes with processing resources (CPUs).   
Moreover there will be constraints for the aforementioned cost function.  And this optimization problem could be solved through different  heuristic methods such as genetic algorithm and so on.   
I know that there's a class named DatacenterBroker that must be extended in order to be able to create my own algorithm for submitting Cloudlets to the defined virtual machines. I'm also aware that in order to create new algorithms to place the defined VMs  in the hosts (in a Datacenter) a class named VmAllocationPolicy (which is defined as an abstract class) has to be extended. But I want to find out what algorithm is used in this class  by default  so I get some ideas on how to  propose new algorithms. But since it is an abstract class I can't see what's inside  its methods. So what do I have to do about it?    
Secondly  I Want to know if it is possible to consider Datacenters as nodes of the network and define links  with specific bandwidths and latencies between those Datacenters. And how am I going to include my optimization code  in the scenario? How to define an algorithm for routing between these Datacenters after the aforementioned placement has taken place? How to define the ingress node and egress nodes in the scenario?   

Or does anyone have any idea if implementing such scenario is possible in mininet environment? how?

thanks

const string ClientId = "...";
const string Username = "...";
SecureString password = ...;

var scopes = new[] { "https://outlook.office365.com/.default" };
var app = PublicClientApplicationBuilder.Create(ClientId).WithAuthority(AadAuthorityAudience.AzureAdMultipleOrgs).Build();
var tokenResult = await app.AcquireTokenByUsernamePassword(scopes, Username, password).ExecuteAsync(cancellationToken);

using var client = new ImapClient();
await client.ConnectAsync("outlook.office365.com", 993, SecureSocketOptions.Auto, cancellationToken);
await client.AuthenticateAsync(new SaslMechanismOAuth2(Username, tokenResult.AccessToken), cancellationToken);

MailKit.Security.AuthenticationException
  HResult=0x80131500
  Message=Authentication failed.
  Source=MailKit
  StackTrace:
   at MailKit.Net.Imap.ImapClient.<AuthenticateAsync>d__81.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
   at TestOffice365OAuth.Program.<MainAsync>d__1.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at TestOffice365OAuth.Program.Main()

Hi Sir,

Need help, i noob in Asp.net. Using VB for my coding;

Situation :-

a) Using Master Page 
b) Got 3 web Form ( Staff.aspx,student.aspx,external.aspx)
c) Every form have Search Textbox

In Staff.aspx, search Textbox working great when connecting to Oracle Database and appear the data holder in other textbox.
But when using Student.aspx or External.aspx, the Search Textbox will appear No Data / Cardholder , in database the data is exist.
the Sql query it ok when i direct include the User ID but when keep in in textbox cannot appear the data.

Plz guide me

Tq