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           ExcelApplication xla = new ExcelApplication();
           Workbook WB= xla.Create(FileFormat.Xlsx);
           Area areaOne= WB[0].CreateArea("A1:B3");
           FileStream fstream = new FileStream(@"C:\temp\outfile.xls", FileMode.Create);           
           areaOne.SaveImage(fstream, System.Drawing.Imaging.ImageFormat.Png, 600, 400);            

	   Dim oExcelApp As New ExcelApplication()           
           Dim wb As Workbook = oExcelApp.Create(FileFormat.Xlsx) 
           Dim areaOne As Area= WB[0].CreateArea("A1:B3")
           Dim fstream As New FileStream("C:\temp\outfile.xls", FileMode.Create)          
           areaOne.SaveImage(fstream, System.Drawing.Imaging.ImageFormat.PngmPng, 600, 400)