AttachDBFilename=|DataDirectory|\database.mdf

AppDomain.CurrentDomain.SetData("DataDirectory", "C:\myDB");

AttachDbFilename='Full\Path\To.MDF'

    public class Person_BeforeCS8
    {
        [Required]
        public string FirstName { get; set; }  // NOT NULL

        public string MiddleName { get; set; } // NULL
    }

    public class Person_AfterCS8
    {
        public string FirstName { get; set; } = null!; // NOT NULL

        public string? MiddleName { get; set; } // NULL
    }

var parentPosts = db.Posts.Where(p => p.ParentPost.Id == postId).ToList();

var parentPosts = db.Posts.Where(p => p.ParentPost!.Id == postId).ToList();

select @@VERSION

Microsoft SQL Server 2014 - 12.0.2254.0 (X64) 
Jul 25 2014 18:52:51 
Copyright (c) Microsoft Corporation
Developer Edition (64-bit) on Windows NT 6.3 <X64> (Build 9600: )

 netstat /abo >>c:\output.txt

declare @t table
(id char(1) primary key,
parent char(1));
 
insert @t values
('A',null),                                   --Level 1
('B', 'A'), ('C', 'A'),                       --Level 2
('D', 'B'), ('E', 'B'),('R','B'), ('F', 'C'), --Level 3
('G', 'D'),                                   --Level 4
('H', 'G'), ('I', 'G');                       --Level 5

;with cte as
(
select id, rnk=0, 
       concats = cast(id as varchar(10))
from @t
where parent is null
 
union all
 
select t.id, rnk+1,
       cast(cte.concats + t.id as varchar(10))
from cte join @t t
on cte.id = t.parent
)
select * from cte
/*
id   rnk         concats
---- ----------- ----------
A    0           A
B    1           AB
C    1           AC
F    2           ACF
D    2           ABD
E    2           ABE
R    2           ABR
G    3           ABDG
H    4           ABDGH
I    4           ABDGI
*/
;with cte as
(
select id, rnk=0, 
       concats = cast(id as varchar(10))
from @t
where parent is null
 
union all
 
select t.id, rnk+1,
       cast(cte.concats + t.id as varchar(10))
from cte join @t t
on cte.id = t.parent
)
select stuff(d.list,1,1,'') as concats
from (select ','+concats
      from cte
  for xml path(''))d(list)
/*
concats
----------------------------------------
A,AB,AC,ACF,ABD,ABE,ABR,ABDG,ABDGH,ABDGI
*/

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Mikayla Hutchinson - Mono: Today and Tomorrow
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int intValue = 182;

string hexValue = intValue.ToString("X");

int intAgain = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);

var bigint =
                System.Numerics.BigInteger.Parse("00010471000001BF001F",
                System.Globalization.NumberStyles.HexNumber,
                System.Globalization.CultureInfo.InvariantCulture);