Populate a ComboBox in a DataGrid in C#

Question

How can I show the items of the List<string> Sections as a Combobox under the Sections field in a DataGrid myDataGrid.

List<string> Sections = new List<string> {"C50", "C40", "C30"};

Currently I'm using the below code to populate the rest of the fields in myDataGrid.

var data = from row in Building.Columns
            select new
            {
                row.Id,
                row.X,
                row.Y,
                row.StartElevation,
                row.EndElevation,
                row.FoundationHeight,
                Sections = ""
            };
myDataGrid.ItemsSource = data;

Answer 1

If you using AutoGenerateColumns="True" you should using AutoGeneratingColumn event (msdn).

XAML:

<DataGrid x:Name="myDataGrid" ItemsSource="{Binding}" 
          AutoGenerateColumns="True"
          AutoGeneratingColumn="myDataGrid_AutoGeneratingColumn"/>

Code-behind:

private void myDataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    if (e.PropertyName == "Sections")
    {
        var cb = new DataGridComboBoxColumn();
        cb.Header = "Sections";
        cb.ItemsSource = new List<string> { "C50", "C40", "C30" };
        cb.SelectedValueBinding = new Binding("Sections");
        e.Column = cb;
    }        
}

Solution with AutoGenerateColumns="False" :

XAML:

<DataGrid x:Name="myDataGrid" ItemsSource="{Binding}" 
          AutoGenerateColumns="False"
          >
    <DataGrid.Columns>
        <DataGridTextColumn Header="Id" Binding="{Binding Id}" />
        <DataGridTextColumn Header="X" Binding="{Binding X}" />
        <DataGridTextColumn Header="Y" Binding="{Binding Y}" />
        <DataGridTextColumn Header="StartElevation" Binding="{Binding StartElevation}" />
        <DataGridTextColumn Header="EndElevation" Binding="{Binding EndElevation}" />
        <DataGridTextColumn Header="FoundationHeight" Binding="{Binding FoundationHeight}" />
        <DataGridComboBoxColumn x:Name="cbSections" Header="Sections" SelectedItemBinding="{Binding Sections}"/>
    </DataGrid.Columns>
</DataGrid>

Code-behind:

...
{
...
myDataGrid.ItemsSource = data;

cbSections.ItemsSource = new List<string> { "C50", "C40", "C30" }; 
...
}