How to convert Windows ids to network credentials in C #?

Question

I want to transfer the credentials of my application pool identification account to the WCF service using the application, I can get the credentials for the application pool identifier using

var identitipoolAccountCred = System.Security.Principal.WindowsIdentity.GetCurrent();

and I want to convert these credentials ( System.Security.principal.WindowsIdentity) to enter the type of network identity ( System.Net.NetworkCredential) in order to transmit the factory WCF channel.

So how to convert Windows ids to network credentials in C #?