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As a .NET developer, you have several ways to build a web app. The official way is to use ASP.NET MVC, or ASP.NET Web API in combination with some client-side framework, like React, Angular or Knockout.

But when you start building big enterprise application, you soon discover that there are not many ready-made solutions for that, and each one is different.

Moreover, you have to learn many new things and build parts of your own infrastructure to make the development convenient for large scale enterprise apps.

DotVVM is a framework which handles client-server communication, validation, SPAs, date-time formatting, and which provides plenty of ready-made controls that you can use immediately.

Also, there is no need to learn many javascript libraries, frameworks and tools. You can do most of the stuff with C#, HTML and CSS only.

DotVVM is a framework that helps you write modern websites in the MVVM fashion.

Dot represents .NET Framework and VVM stands for MVVM - Model View ViewModel pattern.

How Does It Work?

First, you have to define the view. We use HTML syntax, but there are some flavors added. That's why we call it DOTHTML.

Notice the {value: Property} and {command: Method} data-bindings and the custom dot:Something elements - these are called DotVVM controls.

@viewModel DotvvmDemo.CalculatorViewModel, Dotvvm
    Enter the first number: 
    <dot:TextBox Text="{value: Number1}" />
    Enter the second number: 
    <dot:TextBox Text="{value: Number2}" />
    <dot:Button Text="Calculate" Click="{command: Calculate()}" />
    The result is: {{value: Result}}

The second step is to write the viewmodel. The viewmodel is a plain C# class. It doesn't need any INotifyPropertyChanged, you can declare just plain C# properties.

using System;
namespace DotvvmDemo 
    public class CalculatorViewModel 
        public int Number1 { get; set; }
        public int Number2 { get; set; }
        public int Result { get; set; }
        public void Calculate() 
            Result = Number1 + Number2;

And that's it! DotVVM translates the <dot:TextBox> control into <input type="text"> and <dot:Button> into <input type="button">.

The {value: Number1} binding is translated to Knockout JS expressions <input data-bind="value: Number1">.

The {command: Function()} is translated to a JavaScript call of a dotvvm.postBack function. This will call the Calculate function on the server, and all changes to the viewmodel will be applied to the page.

All the JavaScript work is done by DotVVM already, so you can concentrate on the business logic and use a convenient syntax to manipulate with the page DOM.

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