WPF : how to run window application in maximize form

It is very simple just add WindowState="Maximized" in window tag 

<Window x:Class="ObjDataProvider.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow" Height="350" Width="525" WindowState="Maximized">