using Spire.Xls;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;

namespace Convert_Shapes_and_SmartArt_to_Image
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Workbook object
            Workbook workbook = new Workbook();
            //Load the Excel file
            workbook.LoadFromFile("Sample.xlsx");

            //Get the first worksheet
            Worksheet sheet = workbook.Worksheets[0];

            //Create a SaveShapeTypeOption object
            SaveShapeTypeOption shapelist = new SaveShapeTypeOption();
            //Save shapes and SmartArt graphics in the worksheet to images
            List images = sheet.SaveShapesToImage(shapelist);

            //Save images to file
            int index = 0;
            foreach (Image img in images)
            {
                img.Save("Image/" + "toImage" + index + ".Png", ImageFormat.Png);
                index++;
            }
        }
    }
}

Imports Spire.Xls
Imports System.Collections.Generic
Imports System.Drawing.Imaging

Namespace Convert_Shapes_and_SmartArt_to_Image
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            'Create a Workbook object
            Dim workbook As Workbook = New Workbook()
            'Load the Excel file
            workbook.LoadFromFile("Sample.xlsx")

            'Get the first worksheet
            Dim sheet As Worksheet = workbook.Worksheets(0)

            'Create a SaveShapeTypeOption object
            Dim shapelist As SaveShapeTypeOption = New SaveShapeTypeOption()
            'Save shapes and SmartArt graphics in the worksheet to images
            Dim images As List(Of Bitmap) = sheet.SaveShapesToImage(shapelist)

            'Save images to file
            Dim index As Integer = 0

            For Each img As Image In images
                img.Save("Image/" & "toImage" & index & ".Png", ImageFormat.Png)
                index += 1
            Next
        End Sub
    End Class
End Namespace