public static void animategrid(string motion, ref DoubleAnimation slide, ref Grid grid, ref Grid grid2, ref Storyboard sbfade, ref Storyboard sbslide)
    {
        if (motion == "away")
        {
            slide.To = 310;
            slide.From = 0;
        }
        else
        {
            slide.To = 0;
            slide.From = 310;
        }

        switch (grid.Name)
        {
            case "GD_Lockscreen":

                slide.Duration = new Duration(TimeSpan.FromMilliseconds(400.0));
                Storyboard.SetTarget(slide, grid);
                Storyboard.SetTargetProperty(slide, new PropertyPath("RenderTransform.(TranslateTransform.X)"));
                sbfade.Children.Add(slide);
                sbfade.Begin();
                if (grid2.Name == "GD_Login")
                {
                    slide.To = 0;
                    slide.From = 310;
                    slide.Duration = new Duration(TimeSpan.FromMilliseconds(400.0));
                    Storyboard.SetTarget(slide, grid2);
                    Storyboard.SetTargetProperty(slide, new PropertyPath("RenderTransform.(TranslateTransform.X)"));
                    sbslide.Children.Add(slide);
                    sbslide.Begin();
                }
                break;
            case "GD_Login":
                slide.Duration = new Duration(TimeSpan.FromMilliseconds(400.0));
                Storyboard.SetTarget(slide, grid);
                Storyboard.SetTargetProperty(slide, new PropertyPath("RenderTransform.(TranslateTransform.X)"));
                sbfade.Children.Add(slide);
                sbfade.Begin();
                if (grid2.Name == "GD_Background")
                {
                    slide.To = 310;
                    slide.From = 0;
                    slide.Duration = new Duration(TimeSpan.FromMilliseconds(800.0));
                    Storyboard.SetTarget(slide, grid2);
                    Storyboard.SetTargetProperty(slide, new PropertyPath("RenderTransform.(TranslateTransform.X)"));
                    sbslide.Children.Add(slide);
                    sbslide.Begin();
                }
                break;
        }

    }



}

public partial class MainWindow : Window
{

System.Windows.MessageBox.Show("Logged in to server");


        animategrid("loginscreen", "away", "backgroundimg");  <------error is shown here

    }
  }}