SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM

AuditTrail audit = new AuditTrail();
audit.UserName =UserName;
audit.UserCode = UserCode;
audit.ActionPerformed = "Logging In";
audit.ModuleName = "Security";
audit.UpdatedTime = DateTime.Now;

using (var tran = db.BeginTransaction())
{

 db.Save(audit);
 tran.Commit();

}

Its giving Exception: SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.
I'm stuck with this. Pls Help me.