Tutorial by Examples: er

PM> uninstall-Package EntityFramework -Version 6.1.2

var serialPort = new SerialPort("COM1", 9600, Parity.Even, 8, StopBits.One); serialPort.Open(); serialPort.WriteLine("Test data"); string response = serialPort.ReadLine(); Console.WriteLine(response); serialPort.Close();

using System.IO.Ports; namespace TextEchoService { class Program { static void Main(string[] args) { var serialPort = new SerialPort("COM1", 9600, Parity.Even, 8, StopBits.One); serialPort.Open(); string message = &quot...

using System; using System.Collections.Generic; using System.IO.Ports; using System.Text; using System.Threading; namespace AsyncReceiver { class Program { const byte STX = 0x02; const byte ETX = 0x03; const byte ACK = 0x06; const byte NAK = 0x15...

When we use @SpringApplicationConfiguration it will use configuration from application.yml [properties] which in certain situation is not appropriate. So to override the properties we can use @TestPropertySource annotation. @TestPropertySource( properties = { "spring...

1-You need to connect your device to your computer via USB cable. Make sure USB debugging is working. You can check if it shows up when running adb devices(or tns device). 2-Run adb tcpip 5555 3-Disconnect your device (remove the USB cable). 4-Go to the Settings -> About phone -> Status...

While working on the development of an R package it is often necessary to install the latest version of the package. This can be achieved by first building a source distribution of the package (on the command line) R CMD build my_package and then installing it in R. Any running R sessions with p...

The getaddrinfo() function is the recommended POSIX function for interfacing with the system resolver. Depending on system configuration it will perform name lookups in the DNS, /etc/hosts, mDNS, etc. It is preferred over the deprecated gethostbyname() family of functions because it supports both ...

The method charCodeAt retrieves the Unicode character code of a single character: var charCode = "µ".charCodeAt(); // The character code of the letter µ is 181 To get the character code of a character in a string, the 0-based position of the character is passed as a parameter to charCo...

The UNION operator is used to combine the result-set (only distinct values) of two or more SELECT statements. Query: (To selects all the different cities (only distinct values) from the "Customers" and the "Suppliers" tables) SELECT City FROM Customers UNION SELECT City FROM ...

UNION ALL to select all(duplicate values also) German cities from the "Customers" and "Suppliers" tables. Here Country="Germany" is to be specified in the where clause. Query: SELECT City, Country FROM Customers WHERE Country='Germany' UNION ALL SELECT City, Count...

Some email clients (notably Windows Desktop Outlook) collapse tables with no content, even if there are dimensions or padding. To prevent these clients from collapsing the spacer table, you can add an invisible   that serves as content. Then zero out the character's font-size and line-heig...

Using width or height tags to resize images in your markup can create a problem in Internet Explorer browsers. If your reader is viewing an email in-browser, and that email happens to have fluid images in it, they’ll look pretty ugly as they resize. Using -ms-interpolation-mode:bicubic; ensures that...

Functional tests are best described as tests for your user stories. If you've dealt with user stories before they normally follow the following pattern: As a [role], I want to [desire], so that [benefit/desired outcome] For the following examples we'll use this user story as an example: As a Du...

The wheel collider inside unity is built upon Nvidia's PhysX wheel collider, and therefore shares many similar properties. Technically unity is a "unitless" program, but to make everything make sense, some standard units are required. Basic Properties Mass - the weight of the wheel in ...

Django 1.10 introduced a new middleware style where process_request and process_response are merged together. In this new style, a middleware is a callable that returns another callable. Well, actually the former is a middleware factory and the latter is the actual middleware. The middleware facto...

As already pointed out in other pitfalls, catching all exceptions by using try { // Some code } catch (Exception) { // Some error handling } Comes with a lot of different problems. But one perticular problem is that it can lead to deadlocks as it breaks the interrupt system when writ...

Following are the Prerequisites for installing Cookiecutter: pip virtualenv PostgreSQL Create a virtualenv for your project and activate it: $ mkvirtualenv <virtualenv name> $ workon <virtualenv name> Now install Cookiecutter using: $ pip install cookiecutter Change dire...

Unlike most other JavaScript objects, symbols are not automatically converted into a string when performing concatenation. let apple = Symbol('Apple') + ''; // throws TypeError! Instead, they have to be explicitly converted into a string when necessary, (for example, to get a textual description...

For more complex applications, flat execution profiles may be difficult to follow. This is why many profiling tools also generate some form of annotated callgraph information. gperf2dot converts text output from many profilers (Linux perf, callgrind, oprofile etc.) into a callgraph diagram. You can...