Silverlight / WPF - Biding in wpf with mvvm

Hi all

 I m new in wpf, and i got problem to binding class in xaml. I wanted print one msg"hello" in button click.  This is my code....Thanks!!!

<UserControl x:Class="TwoNumberCalculate.CalculatorViewModel"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:vm="TwoNumberCalculate:CalculatorViewModel">




    <UserControl.DataContext>
        <vm:>----------------------------------------->* Its not showing my methods here..
       
    </UserControl.DataContext>
    

Follow these links-

http://msdn.microsoft.com/en-us/magazine/dd419663.aspx

http://www.codeproject.com/KB/WPF/MVVMForDummies.aspx

Here you will get example-

Follow this link also, here also you will get example-

http://msdn.microsoft.com/en-us/library/system.windows.data.binding.aspx

Hope this will help you.