After upgrading to 3.0.0

[lajith111]

After upgrading to vesrion 3.0.0 i am getting below errror. I have raised question in SO

Please some one suugest.

https://stackoverflow.com/questions/77715682/issue-switch-statement-after-upgrading

The code for get cell value

private static string GetCellValue(SpreadsheetDocument document, Cell cell)
 {
     DateTime ReleaseDate = new DateTime(1899, 12, 30);
     SharedStringTablePart stringTablePart = document.WorkbookPart.SharedStringTablePart;
     object value = string.Empty;
     CellFormats cellFormats = (CellFormats)document.WorkbookPart.WorkbookStylesPart.Stylesheet.CellFormats;

     string format = string.Empty; uint formatid = 0;

     if (cell.DataType == null)
     {
         CellFormat cf = new CellFormat();
         if (cell.StyleIndex == null)
         {
             cf = cellFormats.Descendants<CellFormat>().ElementAt<CellFormat>(0);
         }
         else
         {
             cf = cellFormats.Descendants<CellFormat>().ElementAt<CellFormat>(Convert.ToInt32(cell.StyleIndex.Value));
         }

         formatid = cf.NumberFormatId;

         if (cell != null && cell.InnerText.Length > 0)
         {
             value = cell.CellValue.Text;
             if (formatid > 13 && formatid <= 22)
             {
                 DateTime answer = ReleaseDate.AddDays(Convert.ToDouble(cell.CellValue.Text));
                 value = answer.ToShortDateString();
             }

         }
         else
         {

             value = cell.InnerText;
         }
     }

     if (cell.DataType != null)
     {
         switch (cell.DataType.Value)
         {
             case CellValues.SharedString:
                 return stringTablePart.SharedStringTable.ChildElements[Int32.Parse(cell.CellValue.Text)].InnerText;
             case CellValues.Boolean:
                 return cell.CellValue.Text == "1" ? "true" : "false";
             case CellValues.Date:
                 {
                     DateTime answer = ReleaseDate.AddDays(Convert.ToDouble(cell.CellValue.Text));
                     return answer.ToShortDateString();
                 }
             case CellValues.Number:
                 return Convert.ToDecimal(cell.CellValue.Text).ToString();
             default:
                 if (cell.CellValue != null)
                     return cell.CellValue.Text;
                 return string.Empty;
         }
     }

     return value.ToString();
 }

i am getting below error