Question: Is it possible to declare `DataGrid` columns in a style or as a resource?
I would like to do something like this:

```
<....Resources>
    <DataGridColumns x:Key="dgcDataGridColumns">
        <DataGridTextColumn />
        <DataGridTextColumn />
    </DataGridColumns
</....Resources>

<DataGrid Columns="{StaticResource dgcDataGridColumns}" />

```

The reason is that i have to share the column definition for 4 different `DataGrids`. Any way to achieve this? Best would be without code behind!

Answer: 
Columns property of the DataGrid has no setter so it is not possibly. You can however do something like this:

```
<Window.Resources>

    <Controls:DataGrid x:Key="PersonDataGrid" AutoGenerateColumns="False" ItemsSource="{Binding .}" x:Shared="False">
        <Controls:DataGrid.Columns>
            <Controls:DataGridTextColumn Header="First Name" Binding="{Binding Path=FirstName}" IsReadOnly="True"/>
            <Controls:DataGridTextColumn Header="Last Name" Binding="{Binding Path=LastName}" IsReadOnly="True"/>
        </Controls:DataGrid.Columns>
    </Controls:DataGrid>

</Window.Resources>

<StackPanel>
    <ContentControl Content="{StaticResource PersonDataGrid}" DataContext="{Binding Path=Customers}"></ContentControl>
    <ContentControl Content="{StaticResource PersonDataGrid}" DataContext="{Binding Path=Employees}"></ContentControl>
</StackPanel>

```
x:Shared helps to avoid the exception MattS423 has got.

```
<Window.Resources>
    <DataGridTextColumn x:Key="dgtcFirstName" x:Shared="False" Header="First Name" Binding="{Binding FirstName}"/>
    <DataGridTextColumn x:Key="dgtcSecondName" x:Shared="False" Header="Second Name" Binding="{Binding SecondName}"/>
</Window.Resources>

<Grid>
    <StackPanel>
        <DataGrid AutoGenerateColumns="False" Height="200" Name="dataGrid1" Width="200">
            <DataGrid.Columns>
                <StaticResource ResourceKey="dgtcFirstName"/>
                <StaticResource ResourceKey="dgtcSecondName"/>
            </DataGrid.Columns>
        </DataGrid>
        <DataGrid AutoGenerateColumns="False" Height="200" Name="dataGrid2" Width="200">
            <DataGrid.Columns>
                <StaticResource ResourceKey="dgtcSecondName"/>
                <StaticResource ResourceKey="dgtcFirstName"/>
            </DataGrid.Columns>
        </DataGrid>
    </StackPanel>
</Grid>

```