Ok, this is how I made it work.
DLL System.Web.DataVisualization, MS . bin , .
C TempDump -.
<appSettings>
<add key="ChartImageHandler" value="storage=file;timeout=20;dir=c:\TempImageFiles\;" />
</appSettings>
<appSettings>
<add key="ChartImageHandler" value="storage=file;timeout=20;dir=c:\TempDump\;" />
</appSettings>
.