Add, access and read Generic Credentials for a Specific User in .net Application

Question

i want to add generic credentials to Credential Manager for a specific user. I tried using impersonation but it gives error "A specified logon session does not exist. It may already have been terminated". When i do not use "impersonation", I can add credentials easily but only for the user that opens the application. Anybody have any suggestion or answer to solve this problem?

My code fragment:

            using (var imp = new Impersonation("creduserApp", "creduser", "123*+56"))
            {
               //I got error after running the following here

                foreach (var credential in CredentialManager.EnumerateCrendentials())
                {
                   
                    Console.WriteLine(credential);
                }
            }

Impersonation Method:

public Impersonation(string domain, string username, string password)
        {
            var token = ValidateParametersAndGetFirstLoginToken(username, domain, password);
        var duplicateToken = IntPtr.Zero;
        try
        {
            if (DuplicateToken(token, 2, ref duplicateToken) == 0)
            {


                throw new InvalidOperationException("DuplicateToken call to reset permissions for this token failed");
            }

            var identityForLoggedOnUser = new WindowsIdentity(duplicateToken);
            _impersonatedUserContext = identityForLoggedOnUser.Impersonate();
            if (_impersonatedUserContext == null)
            {
                throw new InvalidOperationException("WindowsIdentity.Impersonate() failed");
            }
        }
        finally
        {
            if (token != IntPtr.Zero)
                CloseHandle(token);
            if (duplicateToken != IntPtr.Zero)
                CloseHandle(duplicateToken);
        }
    }