ExportEx does not work?

[#1]

I use the C#  to control the automation, below is the code, it always returns false, the can not export the file.

bool ok = graph.ExportEx(this._exportFileName, 5);

Is there anybody facing this problem?

Thanks,

Tony

[#2]

This problem is fixed. I used the GraphBasic interfaceto export the pivot table, it can not work. So I convert to the PivotTable infterface which works.