Response.Redirect asp.net

Redirects a client to a new URL. Specifies the new URL and whether execution of the current page should terminate.

Parameters

url

The target location.

endResponse

Indicates whether execution of the current page should terminate.

bool continue;

// some code

if (continue)
{
    Response.Redirect("page.aspx", false);
}
else
{
    Response.End();
}

HttpCookie asp.net

ASP.NET > HttpCookie 

The HttpCookie class gets and sets properties of individual cookies.

HttpCookie loginCookie = Request.Cookies.Get("loginCookie");
if (loginCookie == null)
{
     loginCookie = new HttpCookie("loginCookie");
     loginCookie.Value = txtUsr.Text;
     loginCookie.Expires = DateTime.Now.AddDays(15);
     Response.Cookies.Add(loginCookie);
}

OBJECT_ID SQL Server

SQL Server > Built-in Functions > OBJECT_ID

OBJECT_ID returns the database object identification number of a schema-scoped object.

Example:

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

SET XACT_ABORT SQL Server

SQL > Set Statements > XACT_ABORT

Specifies whether SQL Server automatically rolls back the current transaction when a Transact-SQL statement raises a run-time error.






Syntax:
SET XACT_ABORT { ON | OFF }

Example

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
(fld1 INT NOT NULL PRIMARY KEY);
CREATE TABLE tbl2
(fld2 INT NOT NULL REFERENCES tbl1(fld1));
GO
INSERT INTO tbl1 VALUES (1);
INSERT INTO tbl1 VALUES (2);
INSERT INTO tbl1 VALUES (3);
INSERT INTO tbl1 VALUES (4);
GO
SET XACT_ABORT OFF;
GO
BEGIN TRANSACTION;
INSERT INTO tbl2 VALUES (1);
INSERT INTO tbl2 VALUES (2);
INSERT INTO tbl2 VALUES (5); -- Foreign key error. SELECT shows only values 1 and 2 inserted. -- Values 5 insert failed and was rolled back, but
-- XACT_ABORT was OFF and rest of transaction
-- succeeded.

COMMIT TRANSACTION;
GO
SET XACT_ABORT ON;
GO
BEGIN TRANSACTION;
INSERT INTO tbl2 VALUES (3);
INSERT INTO tbl2 VALUES (5); -- Foreign key error.
-- Values 5 insert error with XACT_ABORT ON caused
-- all of the second transaction to roll back.
INSERT INTO tbl2 VALUES (4);
COMMIT TRANSACTION;
GO

SELECT * FROM tbl2;
GO

date datatype SQL Server

SQL Server > Data Types > Date

Default format: YYYY-MM-DD
Range: 0001-01-01 through 9999-12-31

Example

DECLARE @date1 date
CREATE TABLE Table1 ( datefield date )

-- difference between date and datetime

DECLARE @date date= '12-10-21';
DECLARE @datetime datetime= @date;

SELECT @date AS 'date', @datetime AS 'datetime';

--Result
--date              datetime
------------       -----------------------
--2021-12-10  2021-12-10 00:00:00.000

Other Examples

• Set hour and minute to date

How to change colums color to RadGridView (VB.NET)

Telerik > RadGridView > Cell Formatting

CellFormatting event is used to add formatting to grid cells

Because of UI virtualization in RadGridView, cell elements are created only for currently visible cells. To prevent applying the formatting to other columns' cell elements all customization should be reset for the rest of the cell elements.            Example: Change Forecolor in CellFormating Events

Imports Telerik.WinControls.UI
Imports Telerik.WinControls

Private Sub grd_CellFormatting(sender As System.Object, e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles grd.CellFormatting
 
 If e.CellElement.ColumnInfo.Name = "total" Then
  e.CellElement.ForeColor = Color.Blue
 Else
  e.CellElement.ResetValue(LightVisualElement.ForeColorProperty, ValueResetFlags.Local)
 End If

End Sub

Cursor SQL Server

SQL Server > Data Types > Cursor

SQL Server statements produce a complete result set, but there are times when the results are best processed one row at a time. Opening a cursor on a result set allows processing the result set one row at a time. You can assign a cursor to a variable or parameter with a cursor data type.

Permissions default to any user that has SELECT permissions;

Syntax:

DECLARE cursor_name CURSOR [ LOCAL | GLOBAL ]
     [ FORWARD_ONLY | SCROLL ]
     [ STATIC | KEYSET | DYNAMIC | FAST_FORWARD ]
     [ READ_ONLY | SCROLL_LOCKS | OPTIMISTIC ]
     [ TYPE_WARNING ]
     FOR select_statement
     [ FOR UPDATE [ OF column_name [ ,...n ] ] ]

Example:

create table #temp
(id int)
declare @p int = 0
while @p < 10
begin
       insert into #temp
       values(@p)
       set @p = @p + 1
end

select * from #temp -- return all rows

DECLARE @id int

DECLARE c CURSOR FOR
select
   id
from
  #temp
OPEN c
FETCH NEXT FROM c INTO @id
WHILE @@FETCH_STATUS = 0
BEGIN
   print @id -- scroll row by row
    FETCH NEXT FROM c INTO @id
END
CLOSE c;
DEALLOCATE c;
drop table #temp