How to display very long numbers in a cell without rounding off in C#, VB.NET?

using Syncfusion.XlsIO;
using System.IO;
 
namespace LongNumber_WithoutRounding
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ExcelEngine excelEngine = new ExcelEngine())
            {
                IApplication application = excelEngine.Excel;
                application.DefaultVersion = ExcelVersion.Excel2013;
 
     // Create a new workbook
     IWorkbook workbook = application.Workbooks.Create(1);
 
     // Access the first worksheet in the workbook
     IWorksheet worksheet = workbook.Worksheets[0];
    
     // Entering a long number with text number format
     worksheet.Range["A1"].NumberFormat = "@";
     worksheet.Range["A1"].Value = "1234567890987654321";
 
     // Autofit column to view view entire cell contents
     worksheet.AutofitColumn(1);
 
     // Saving the workbook as stream
     Stream outputStream = File.Create("Output.xlsx");
                workbook.SaveAs(outputStream);
            }
        }
    }
}

Imports System.IO
Imports Syncfusion.XlsIO
 
Namespace LongNumber_WithoutRounding
  Class Program
      Private Shared Sub Main(ByVal args() As String)
 Using excelEngine As ExcelEngine = New ExcelEngine
     Dim application As IApplication = excelEngine.Excel
     application.DefaultVersion = ExcelVersion.Excel2013
 
     'Create a new workbook
     Dim workbook As IWorkbook = application.Workbooks.Create(1)
 
     'Access the first worksheet in the workbook
     Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
     'Entering a long number with text number format
     worksheet.Range("A1").NumberFormat = "@"
     worksheet.Range("A1").Value = "1234567890987654321"
 
     'Autofit column to view view entire cell contents
     worksheet.AutofitColumn(1)
 
     'Saving the workbook as stream
     Dim outputStream As Stream = File.Create("Output.xlsx")
     workbook.SaveAs(outputStream)
 End Using
      End Sub
  End Class
End Namespace