The VerticalAlignment property of the Legend allows you to vertically align the position of the legend. The full path to this property is Legend.VerticalAlignment. The property values are: Top Out Side , Top , Center , Bottom , Bottom Out Side ..
Value description:
top outside. Legends are placed above and below the chart area. The following illustration shows where the legend is positioned when the VerticalAlignment property is set to TopOut Side.
By default the VerticalAlignment property is set to Top.