Many apps require user authentication. Most of these apps have a way to communicate to some remote webservice which performs the authentication on the server. However the client also has to perform some basic client-side authentication, mostly to validate the data input.

Because of that we need a way to validate textfields like username, email and password. Well we have a library that is easy yet flexible enough to cater for this type of validation.

In this piece we see how to perform login validation using the login-validator library.

Let's start.

VB.NET Readonly DataGridViewCheckBoxColumn Tutorial and Example

This is a VB.NET tutorial. We see how to populate a datagridviewview with dictionary containing strings and boolean values. The thing is that our boolean values should not be editable at runtime. Instead when the user clicks any cell in the datagridview, he should get the value shown in messagebox and not be able to edit it.

VB.NET Readonly DataGridViewCheckBoxColumn Tutorial and Example

This is a VB.NET tutorial. We see how to populate a datagridviewview with dictionary containing strings and boolean values. The thing is that our boolean values should not be editable at runtime. Instead when the user clicks any cell in the datagridview, he should get the value shown in messagebox and not be able to edit it.

C# Flurl HTTP with ListBox Example and Tutorial.

In this piece we see how to download JSON data from online asynchronously via Async Await and then populate a ListBox. We will be using the Flurl HTTP library.

An Executor is an object that executes submitted Runnable tasks.

In this piece we want to look at executor with regards to Android Development.

Android Handler and ProgressBar Update Tutorial and Examples.

In this tutorial we want to see how to post updates from a background thread to the user interface thread using a Handler.

We click a button and simulate doing heavy work in the background. Meanwhile we are able to update our progressbar as the work continues.

The ability to pick dates is one of the most important aspects of any user interface framework. And certainly Flutter is a framework for android applications development. Flutter allows us be pick dates with various libraries out there we can use. One such is the flutter_date_picker which we use in this project.

Through it we will be able to pick dates and show in a snackbar.

JavaFX ListView CRUD Tutorial and Example

This is a JavaFX ListView CRUD tutorial. We see how to perform basic CRUD - ADD UPDATE DELETE in Java FX against a ListView.

Android Notfication Tutorial and Several Examples.

In android, a notification is a short message normally displayed outside an application's user interface.

Android ListActivity Tutorial and Examples.

A ListActivity is an activity that displays a list of items by binding to a data source such as an array or Cursor. ListActivity also exposes to us event handlers when the user selects an item.

This is a class that derives from the Activity class. ListActivity is meant to be used when you plan to use a ListView. In fact it does host a ListView object that can be bound to different data sources, typically either an array or a Cursor holding query results.