Generic Id class vb.net to c#

Hi,

I recently found a very useful Id class which could be inherited by any class to actually store an Id.

Here is the vb.net version:

Option Strict On
Option Explicit On
Option Infer On

Public MustInherit Class Entity(Of T As Structure)

    Protected Friend Overridable Property Id As T

    Public Overrides Function Equals(ByVal obj As Object) As Boolean
        Dim other As Entity(Of T) = TryCast(obj, Entity(Of T))
        If other Is Nothing Then Return False
        If Not [GetType].Equals(other.GetType) Then Return False
        If Transient() OrElse other.Transient Then
            Return MyBase.Equals(obj)
        End If
        Return Id.Equals(other.Id)
    End Function

    Public Overrides Function GetHashCode() As Integer
        If Transient() Then Return MyBase.GetHashCode()
        Return Id.GetHashCode
    End Function

    Protected Overridable Function Transient() As Boolean
        Dim value As T = Nothing
        Return Id.Equals(value)
    End Function
End Class

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No I tried translating this into c# but am having  some problems:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TCG.Domain
{
    abstract class Entity<T> where T : struct
    {
        protected internal virtual T Id;

        public override bool Equals(object obj)
        {
            Entity<T> other = obj as Entity<T>;
            if(other == null){return false;}
            if(![GetType].Equals(other.GetType)){return false;}
            if(Transient() || other.Transient()){return Id.Equals(obj);}
        }

        public override int GetHashCode()
        {
            if(Transient()) {return base.GetHashCode();}
            return Id.GetHashCode();
        }

        protected virtual bool Transient()
        {
            T value == null;
            return Id.Equals(value);
        }
    }
}

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The problems are at:
[GetType] which doesn't really give me any indication in the error message on what to change.
and T value == null

I'm new to learning c# but have a good knowledge on vb.net.

Any ideas on what to change?