Not working. The code you have specified is working for "forecolor" only, does not work for "backgroundcolor". I have reviewed the "aspose.cell" documentation but seems to be doesn't work for "solid background color".
Please specify whether the .component supports this feature or not
In MS Excel, you can set 2 color for a cells: ForegroundColor and BackgroundColor. If you set "Solid" background color, actually you are setting the foreground color. Only when you set the pattern other than solid, the background color will show. That's the routine of MS Excel.