How to convert the SfDataGrid to Image?

using Syncfusion.UI.Xaml.Grid.Converter;
using Syncfusion.XlsIO;
private void ConvertToImage_Click(object sender, RoutedEventArgs e)
{
    var excelExportingOptions = new ExcelExportingOptions();
    ExcelEngine excelEngine = SfdataGrid.ExportToExcel(SfdataGrid.View, excelExportingOptions);
    IWorkbook workbook = excelEngine.Excel.Workbooks[0];
    IWorksheet sheet = workbook.Worksheets[0];
    sheet.UsedRangeIncludesFormatting = false;
    int lastRow = sheet.UsedRange.LastRow + 1;
    int lastColumn = sheet.UsedRange.LastColumn;
    System.Drawing.Image img = sheet.ConvertToImage(1, 1, lastRow, lastColumn, ImageType.Bitmap, null);
    img.Save("Sample.png", ImageFormat.Png);
    System.Diagnostics.Process.Start("Sample.png");
}