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Send AntiForgeryToken via jQuery Ajax in ASP.NET Core

In ASP.NET Core, if we use jQuery Ajax to post data to the server, and we want the ValidateAntiForgeryToken attribute to work. We have to do some tricks. The official document didn't document how to do it via jQuery. Let me show you how to do it. Please do read the official document first: https://docs.microsoft.com/en-us/aspnet/core/security/anti-request-forgery?view=aspnetcore-2.1  In my pract...

AJAX ASP.NET jQuery .NET Core

Prevent Image Hotlinking in ASP.NET/Core Applications

Introduction As a website developer, we sometimes don't want the images on our own website to be directly referenced and showed on other's website. It can cause a lot network bandwidth for our datacenters in some cases, which means costing money for us to pay for the one who use our images. For example, your website is A.com, you have an image on http://a.com/facepalm.jpg and B.com used your ima...

ASP.NET IIS .NET Core

How to Fix Extended TitleBar Overlapping NavigationView PaneToggleButton

In UWP Apps, we some times extend our main view into title bar to get rid of Windows 10 default title bar. However if you are using NavigationView under extended title bar, you will find your PaneToggleButton overlapped by the title bar. And the user won't be able to click on the upper part of the button because it is where the title bar need to respond to window drag actions. This image shows th...

XAML UWP

Windows Community Toolkit: Use CameraPreview to Take Photos

In UWP Apps, if we want to use the device's camera to take photos and save to a file, it is used to be some how complicated, the developer need to know about quite a lot things and also write quite a few code to get it down (As you can find the Camera examples from Microsoft offical sample code). In fact, in many cases, we just want to take a photo by the most easy and default options via the came...

UWP Camera

Read System Certificates in UWP

In Windows, we can view and manage the certificates using certmgr.msc, which is a system management console included in Windows itself.  However, what if we want to view the certificates information in an UWP app? Here is the answer. First thing first, the method I use does not apply to UWP only. In fact it is from a WPF app I wrote. As Microsoft released .NET Standard 2.0, which allows me to...

UWP

Deploy Linux VPN Server on Microsoft Azure

For some unspeakable reasons, this article can not expose too many details about every steps to setup and configure the VPN server, but the key steps and scripts will all be listed.  So you will need basic Linux command knowledge and some Azure experience in order to complete the operation.  The reason for choosing Linux over Windows is because the cost is way less then Windows machines, so that...

VPN Azure Linux

Send Feedback in UWP Apps by Windows 10 Feedback Hub

After our app has been put on Microsoft Store, there are a lot of ways to get users to send feedback, such as email, store reviews, or even write our own API collect feedback. But in fact, Windows 10 Feedback Hub can also be used to send feedbacks for our own Apps. Those who are familiar with Windows Insider know that when Windows 10 is installed, the system has a Feedback Hub, which is usually u...

UWP

Customize Acrylic Brush in UWP Applications

Windows 10 Fall Creators Update (Build 16299) added acrylic brush, this is a UI brush that similar to Windows 7 Aero effect. A lot in box Windows Apps, such as Calculator are updated with the acrylic brush. However, the built in brushes will not always meet our own requirments. Especially when Windows automatically disable render of acrylic, such as low power mode, or with an inactive window, i...

UWP

Apply Keyboard Short Cuts in UWP

A greate Windows App requires not only mouse and touch screen friendly, but also need to think about keyboards. Especially for some common short cuts, like Undo (CTRL + Z). So that the App can provide better user experience.  So how can we define short cut keys in UWP? Take my App Tracing as example, I need to implement short cuts for Undo (CTRL + Z). First, we need to consider which Control is b...

UWP

Show Confirm Dialog When User Close UWP App

When our UWP Application deal with user data in it, e.g. like drawings or documents, we usually want to make sure user won't close the App by accident and lose their work. Just like what you see in a Office application, it will ask you if you want to save your document before close the App. For a long time, UWP could not do that in a normal way. Because it is not a general public API and it is st...

UWP