Convert Excel worksheet to image in ASP.NET Core.

using Syncfusion.XlsIO;
using Syncfusion.XlsIORenderer;
using System.IO;

@{Html.BeginForm("CreateDocument", "Home", FormMethod.Get);
{
<div>
    <input type="submit" value="Create Document" style="width:150px;height:27px" />
</div>
}
Html.EndForm();
}

//Initialize ExcelEngine.
using (ExcelEngine excelEngine = new ExcelEngine())
{
    //Initialize Application.
    IApplication application = excelEngine.Excel;
 
    //Set default version for application.
    application.DefaultVersion = ExcelVersion.Excel2013;
 
    string basePath = _hostingEnvironment.WebRootPath + @"\XlsIO\sample.xlsx";
 
    FileStream sampleFile = new FileStream(basePath, FileMode.Open);
 
    //Open a workbook.
    IWorkbook workbook = application.Workbooks.Open(sampleFile);
 
    IWorksheet worksheet = workbook.Worksheets[1];
    
    // Initialize XlsIORenderer
    application.XlsIORenderer = new XlsIORenderer();
 
    //Create a new memory stream to save the image
    Stream stream = new MemoryStream();
 
    //Convert worksheet to image and save it to stream.
    worksheet.ConvertToImage(worksheet.UsedRange, stream);
            
   stream.Position = 0;
            
   //Download the converted Image in the browser.
   FileStreamResult fileStreamResult = new FileStreamResult(stream, "image/PNG");
   fileStreamResult.FileDownloadName = "Output.png";
   return fileStreamResult; 
}