WPF DataGrid – Set a cell into edit mode programmatically

To programatically add a row:

DataGrid.Items.Add(new DataItem());

To programatically add a column:

DataGridTextColumn textColumn = new DataGridTextColumn(); 
textColumn.Header = "First Name"; 
textColumn.Binding = new Binding("FirstName"); 
dataGrid.Columns.Add(textColumn); 

Check out this post on the WPF DataGrid discussion board for more information.

you can add the event handler in the ItemContainerStyle (which is the style applied to a row) :

<DataGrid ... >
    <DataGrid.ItemContainerStyle>
        <Style TargetType="DataGridRow">
            <EventSetter Event="MouseDoubleClick" Handler="Row_DoubleClick"/>
        </Style>
    </DataGrid.ItemContainerStyle>
    ...
</DataGrid>

Then, in the handler, you can check if the row is selected

private void Row_DoubleClick(object sender, MouseButtonEventArgs e)
{
    // execute some code
}