WPF C#

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:s="clr-namespace:System;assembly=mscorlib"
        xmlns:src="clr-namespace:MyNameSpace.EnvironmentInfo2" 
        Title="Environment Info">
    
        
    

    
        
                                      ConverterParameter=
"Operating System Version: {0}
.NET Version: {1}
Machine Name: {2}
User Name: {3}" >
                
                
                
                
            
        

    


//File:Window.xaml.cs
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
namespace MyNameSpace.EnvironmentInfo2
{
    public class FormattedMultiTextConverter : IMultiValueConverter
    {
        public object Convert(object[] value, Type typeTarget, 
                              object param, CultureInfo culture)
        {
            return String.Format((string) param, value);
        }
        public object[] ConvertBack(object value, Type[] typeTarget, 
                                    object param, CultureInfo culture)
        {
            return null;
        }
    }
}