<UserControl Loaded="UserControl_Loaded">
    <Grid>
        <ListBox x:Name="list_files">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid>
                        <TextBlock Text="{Binding FileName}" FontWeight="Bold"/>
                        <TextBlock Text="{Binding FilePath}"/>
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</UserControl>

private void UserControl_Loaded(object sender, RoutedEventArgs e) {
    for(int i = 1; i < 10; i++) {
        this.list_files.Items.Add(new {
            FileName = "Some name " + i,
            FilePath = "SomePath " + i
        });
    }
}

public class MFile {
    public string FileName;
    public string FilePath;
}

private void UserControl_Loaded(object sender, RoutedEventArgs e) {
    for(int i = 1; i < 10; i++) {
        this.list_files.Items.Add(new MFile {
            FileName = "Some name " + i,
            FilePath = "SomePath " + i
        });
    }
}

public class MFile {
    public string FileName { get; set; }
    public string FilePath { get; set; }
}