Keypress event in WPF to validate integer input is replaced by PreviewTextInput in C#

In WPF we don't have keypress event, generally people used keypress event in windows forms application to validate text input. Now in this example I have showed how you can validate input from textbox using PreviewTextInput event. In this example I validated input to accept float values, you can use this to validate integer or any other number type validation.

Code used in example is:

XAML:

<Window x:Class="TestApplication.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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