How to make the command connection in silverlight MVVM? - silverlight

Question

I trying to use MVVM in some silverlight modal that i wrote -
I wrote the view - and the viewmodel part - but i need to make the command between them and i don't know how to do it.
In the view i have single button that will launch the command.
How to do it ?
Thanks for the help.

Answer 1

In View Model
private RelayCommand _Command;
public RelayCommand Command
{
get
{
if (_Command == null)
{
_Command= new RelayCommand(() =>
{
});
}
return _Command;
}
private set { }
}
USE PARAMETERS
private RelayCommand<string> _Command;
public RelayCommand<string> Command
{
get
{
if (_Command == null)
{
_Command= new RelayCommand<string>((X) =>
{
});
}
return _Command;
}
private set { }
}
In View
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:gs_cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.SL4"
<Button Grid.Row="1" Grid.Column="1" Margin="4" HorizontalAlignment="Right" Name="btnSelect" Content="..." Width="25" Height="25" TabIndex="2">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<gs_cmd:EventToCommand Command="{Binding Path=Command,Mode=OneWay}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>

Answer 2

Another version with Parameters, to add to Masoomian's anser:
private RelayCommand<MyViewModel> _Command;
public RelayCommand<MyViewModel> Command
{
get
{
if (_Command == null)
{
_Command= new RelayCommand<MyViewModel>((vm) =>
{
vm.IsBusy = true; // Set a Parameter
vm.DoSomething(); // Do some work
// Call other methods on the View Model as needed
// ...
});
}
return _Command;
}
private set { }
}