Excel report file conversion to PowerBI report

I am trying to convert the Excel file(.xlsx) into the powerBI report file(.pbix). I have created the powerBI report(.pbix) file and trying to see that in XML format.But I could not able to see this .pbix file in the .xml format.Is it possible or not to convert the Excel file into the PowerBI report file by using VB.Net (or) C#.Net code?

Thanks & Regards,

Chandramouli. E