WPF rounded corner textbox

I don't know WPF and am now learning it. I was looking for rounded corners TextBox in WPF. So I searched Google and found a piece of XAML :

 <!–Rounded Corner TextBoxes–>
<ControlTemplate x:Key=”RoundTxtBoxBaseControlTemplate” TargetType=”{x:Type Control}”>
<Border Background=”{TemplateBinding Background}” x:Name=”Bd” BorderBrush=”{TemplateBinding BorderBrush}”
BorderThickness=”{TemplateBinding BorderThickness}” CornerRadius=”6″>
<ScrollViewer x:Name=”PART_ContentHost”/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property=”IsEnabled” Value=”False”>
<Setter Property=”Background” Value=”{DynamicResource {x:Static SystemColors.ControlBrushKey}}” TargetName=”Bd”/>
<Setter Property=”Foreground” Value=”{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}”/>
</Trigger>
<Trigger Property=”Width” Value=”Auto”>
<Setter Property=”MinWidth” Value=”100″/>
</Trigger>
<Trigger Property=”Height” Value=”Auto”>
<Setter Property=”MinHeight” Value=”20″/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>

So please tell me where to paste this XAML. Please help me in detail. I am a beginner in WPF.

Solution

In WPF you can modify or recreate the look and feel of controls. So if your example what they have done is they changed the appearance of the TextBox by modifying the ControlTemplate of the existing TextBox. So to see and explore the piece of code just use the below code

<Window x:Class="WpfApplication4.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Window.Resources>
    <ControlTemplate x:Key="TextBoxBaseControlTemplate" TargetType="{x:Type TextBoxBase}">
        <Border Background="{TemplateBinding Background}" 
                x:Name="Bd" BorderBrush="Black"
                BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="10"> 
            <ScrollViewer x:Name="PART_ContentHost"/>
        </Border>
        <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="False">
                <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" TargetName="Bd"/>
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
            </Trigger>
            <Trigger Property="Width" Value="Auto">
                <Setter Property="MinWidth" Value="100"/>
            </Trigger>
            <Trigger Property="Height" Value="Auto">
                <Setter Property="MinHeight" Value="20"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
</Window.Resources>
<Grid>
    <TextBox Template="{StaticResource TextBoxBaseControlTemplate}" Height="25" Margin="5"></TextBox>
</Grid>

So we have declared a static resource in the Resource section of the Window and we have used the Resource TextBoxBaseControlTemplate in the Template property of the TextBox as Template="{StaticResource TextBoxBaseControlTemplate}" .

Templates to Customize WPF Controls just refere this document to get an idea

http://msdn.microsoft.com/en-us/magazine/cc163497.aspx