DataGrid WPF VS2010 tutorial

Thanks for the links!
I have tried the foreground colour link, but not got it working yet - sorry for being a beginner at this!
I done this in MainWindow.xaml.cs:

namespace WpfDataGridSQL
{
///

/// Interaction logic for MainWindow.xaml
///

///

[ValueConversion(typeof(DateTime), typeof(String))]
public class NameToBrushConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string input = value as string;
switch (input)
{
case "John":
return Brushes.LightGreen;
default:
return DependencyProperty.UnsetValue;
}
}

public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
}
...

and then in MainWindow.xaml done this:
<window x:class="WpfDataGridSQL.MainWindow"
="" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="WpfDataGridSQL" title="MainWindow" height="612" width="1057">

<window.resources>
<local:nametobrushconverter x:key="NameToBrushConverter">

...

however I come up with the errors:
Error 1 The tag 'NameToBrushConverter' does not exist in XML...
and
Error 2 The type 'local:NameToBrushConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built....
I have either done something stupid or missing an obvious step!
Thanks for any help...
Mike

sorry, in MainWindow.xaml I have done this:
<window x:class="WpfDataGridSQL.MainWindow"
="" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="WpfDataGridSQL" title="MainWindow" height="612" width="1057">

<window.resources>
<local:nametobrushconverter x:key="NameToBrushConverter">

...

try this:

xmlns:local="WpfDataGridSQL"
Title="MainWindow" Height="612" Width="1057">

<window.resources>
<local:nametobrushconverter x:key="NameToBrushConverter">