C# Nullable DateTime

C# > System Namespace > DateTime > Nullable DateTime

// Error Cannot convert null to 'System.DateTime' because it is a non-nullable value type 
   

DateTime AgendaValidFrom;

AgendaValidFrom = null;

Solution:
Add ? to DateTime

DateTime? AgendaValidFrom = null; // Declare a nullable DateTime instance and assign to null.

Delete from table using join SQL Server

SQL Server > DML > DELETE

Removes rows from a table.

Example

To delete from tables using join you must specify an alias for the table from which to delete data.

IF OBJECT_ID(N'tbl1', N'U') IS NOT NULL

       DROP TABLE tbl1;
GO
IF OBJECT_ID(N'tbl2', N'U') IS NOT NULL
       DROP TABLE tbl2;
GO

CREATE TABLE tbl1

(
       id           int ,
       name   varchar(50)
);
GO
CREATE TABLE tbl2
(
       id           int ,
       name   varchar(50)
);
GO

INSERT INTO tbl1 values  (1,'john'), (2,'dan') , (3,'laura')

INSERT INTO tbl2 values  (1,'john')
GO

select * from tbl1

--id name
--1 john
--2 dan
--3 laura

DELETE
  a
from
  tbl1 a
join tbl2 b on a.id = b.id

select * from tbl1

--id name
--2 dan
--3 laura

GO

COUNT_BIG SQL Server

SQL Server > Built-in Functions > COUNT_BIG

COUNT_BIG is the same like COUNT but returns bigint data type value.

Date Functions C#

C# > System Namespace > DateTime > Add Methods

Returns a new DateTime that adds the specified number of  years, days, minutes, months, seconds to the value of this instance.

Example:

DateTime AgendaValidTill = DateTime.Now.AddYears(10);
// add days

AgendaValidTill = DateTime.Now.AddDays(10);
AgendaValidTill = DateTime.Now.AddMinutes(10);
AgendaValidTill = DateTime.Now.AddMonths(10);
AgendaValidTill = DateTime.Now.AddSeconds(10);

Date functions SQL Server

SQL Server > Date&Time > Date Functions



-- Selecting the Current Year/Get Current Year/Separate Year Part from Date
Select DatePart(YY, GetDate()) as Current_Year
-- Selecting the Current Quarter/Get Current Quarter/Separate Quarter Part from Date
Select DatePart(QQ, GetDate()) as Current_Quarter
-- Selecting the Current Month/Get Current Month/Separate Month Part from Date
Select DatePart(MM, GetDate()) as Current_Month
-- Selecting the Current Hour/Get Current Hour/Separate Hour Part from Date
Select DatePart(HH, GetDate()) as Current_Hour
-- Selecting the Current Minute/Get Current Minute/Separate Minute Part from Date
Select DatePart(minute, GetDate()) as Current_Minute

-- Selecting the Name of Current Month/Get Name of Current Month/Separate Month Part from Date and display its Name
Select DateName(month, GetDate()) as Current_Month_Name
-- Selecting the Name of Current Month/Get Name of Current Month/Separate Month Part from Date and display its Name
Select DateName(day, GetDate()) as Current_Day
-- Selecting the Name of Current Month/Get Name of Current Month/Separate Month Part from Date and display its Name
Select DateName(wk, GetDate()) as Current_Week

Restart asp.net application

ASP.NET > HttpRuntime > UnloadAppDomain


HttpRuntime.UnloadAppDomain Method

Terminates the current application. The application restarts the next time a request is received for it.

UnloadAppDomain is useful for servers that have a large number of applications that infrequently receive requests. Rather than keep application resources alive for the lifetime of the process, UnloadAppDomain allows programmatic shutdown of unused applications.

Example

Restart asp.net application

using System;

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace editor.Admin
{
    public partial class restart : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            System.Web.HttpRuntime.UnloadAppDomain();
        }
    }
}

 

Setting up a Sent Mail rule in Thunderbird

Setting up a Sent Mail rule in Thunderbird
1. Click on Tools > Account Settings
2. Under your Account Name (the example below shows Work Account, you may have simply named yours IMAP), select Copies and Folders

Make sure there is a tick next to Place a copy in: You then have TWO choices.
OPTION ONE
"Sent" folder on By default Thunderbird selects "Sent" folder on This means that Thunderbird will create a folder for you called Sent under your IMAP account and all your sent items will filter into this folder.
OPTION TWO
Other You may already have a Sent Mail folder set up on your IMAP account. By selecting Other you can specify which folder you would like your sent mail to filter into. To select an alternative folder: Click on the following icon: Select your Account Name (not Local Folders) Choose the Sent Mail folder you require
Click OK to save your changes.