Apply Inner and Global Style's To Windows Phone Controls

Open Visual Studio 
File --> Project --> New Project
Select Windows Phone Apps

After Create Project, Open the Main.xaml

Create TextBlock Control

Write Inner Style in Page

 <Page.Resources>

        <Style x:Key="tbInnerStyle" TargetType="TextBlock">

            <Setter Property="FontFamily" Value="Sege UI"></Setter>

            <Setter Property="FontSize" Value="28"></Setter>

        </Style>

    </Page.Resources>

We can apply Inner Style to TextBlock control

  <TextBlock Text="Hello Windows Phone" Style="{StaticResource tbInnerStyle}" >

            </TextBlock>

Press F5 and See Inner Style Output here.

Now we are going apply Global Style to Button Control

Open the App.xaml file and write global style

 <Application.Resources>

        <Style x:Key="tbGlobalStyle" TargetType="Button">

            <Setter Property="FontFamily" Value="Sege UI"></Setter>

            <Setter Property="Width" Value="250"></Setter>

            <Setter Property="Foreground" Value="Green"></Setter>

        </Style>

    </Application.Resources>

After that style key name: tbGlobalStyle apply to button 

 <Button Style="{StaticResource tbGlobalStyle}" Content="Global Style Button" >

 </Button>

Press F5 See Global Style Button Output.