I alredy have this:

public static object GetDBValue(object ObjectEvaluated)
 {
  if (ObjectEvaluated == null)
   return DBNull.Value;
  else
   return ObjectEvaluated;
 }
used like:

 List<SqlParameter> Params = new List<SqlParameter>();
 Params.Add(new SqlParameter("@EntityType", GetDBValue(EntityType)));

Now i wanted to keep the same interface but extend that to use it with nullable

 public static object GetDBValue(int? ObjectEvaluated)
 {
  if (ObjectEvaluated.HasValue)
   return ObjectEvaluated.Value;
  else
   return DBNull.Value;
 }

 public static object GetDBValue(DateTime? ObjectEvaluated)
 {...}

but i want only 1 function GetDBValue for nullables. How do I do that and keep the call as is is? Is that possible at all?

I can make it work like:

 public static object GetDBValue<T>(Nullable<T> ObjectEvaluated) where T : struct
 {
  if (ObjectEvaluated.HasValue)
   return ObjectEvaluated.Value;
  else
   return DBNull.Value;
 }

But the call changes to:

Params.Add(new SqlParameter("@EntityID ", GetDBValue<int>(EntityID)));