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           ExcelApplication xla = new ExcelApplication();
           Workbook WB= xla.Create(FileFormat.Xlsx);
           Chart chartOne= WB[0].Charts[0];
           FileStream fstream = new FileStream(@"C:\temp\outfile.xls", FileMode.Create);           
           chartOne.SaveImage("Path/filename.png")fstream, System.Drawing.Imaging.ImageFormat.Png);            

	   Dim oExcelApp As New ExcelApplication()           
           Dim wb As Workbook = oExcelApp.Create(FileFormat.Xlsx) 
           Dim chartOne As Chart = WB[0].Charts[0]
           Dim fstream As New FileStream("C:\temp\outfile.xls", FileMode.Create)          
           chartOne.SaveImage("Path/filename.png")fstream, System.Drawing.Imaging.ImageFormat.Png)