WPF & MVVM: Get values from textboxes and send it to ViewModel

I'm trying to get the value of two Texboxes (I'm simulating a login window) when I press a button. The command assigned in the button fires correctly, but I don't know how to get the value of the textboxes to do the "login".

This is my ViewModel:

class LoginViewModel : BaseViewModel
{   
    public LoginViewModel()
    {

    }

    private DelegateCommand loginCommand;
    public ICommand LoginCommand
    {
        get
        {
            if (loginCommand == null)
                loginCommand = new DelegateCommand(new Action(LoginExecuted),
                               new Func<bool>(LoginCanExecute));
                return loginCommand;
            }
        } 

    public bool LoginCanExecute()
    {
        //Basic strings validation...
        return true;
    }
    public void LoginExecuted()
    {
        //Do the validation with the Database.
        System.Windows.MessageBox.Show("OK");
    } 
}

This is the view:

 <Grid DataContext="{StaticResource LoginViewModel}">

            <TextBox x:Name="LoginTxtBox" HorizontalAlignment="Left" Height="23" Margin="34,62,0,0" Width="154" />
            <PasswordBox x:Name="PasswordTxtBox" HorizontalAlignment="Left" Height="23" Margin="34,104,0,0" Width="154"/>
            <Button x:Name="btnAccept"
            HorizontalAlignment="Left" 
            Margin="34,153,0,0" 
            Width="108" 
            Content="{DynamicResource acceptBtn}" Height="31" BorderThickness="3"
            Command="{Binding LoginCommand}"/>

If somebody can help...I'll be infinitely grateful.