See below the samples of importing data from jagged array to Excel spreadsheet in C# and Visual Basic .NET using Bytescout Spreadsheet SDK.

C#

using System.Diagnostics;
using System.IO;

namespace Bytescout.Spreadsheet.Demo.Csharp.ImportFromJaggedArray
{
    class Program
    {
        static void Main(string[] args)
        {
            const string fileName = "CSharpImportFromJaggedArray.xls";
            
            // Create a new spreadsheet
            Spreadsheet spreadsheet = new Spreadsheet();

            // Get the data from the jagged array that we want to import
            string[][] periodicTable = GetJaggedArray();

            // Import data into spreadheet
            spreadsheet.ImportFromJaggedArray(periodicTable);

            // Save the spreadsheet
            if (File.Exists(fileName)) File.Delete(fileName);
            spreadsheet.SaveAs(fileName);

            // Close spreadsheet
            spreadsheet.Close();
            
            // Open the spreadsheet
            Process.Start(fileName);
        }

        /// <summary>
        /// Creates a jagged array of the period table of elements
        /// </summary>
        /// <returns>Jagged array of the periodic table of elements</returns>
        private static string[][] GetJaggedArray()
        {
              string[][] periodicTable = {
                           new string[] {"H","He"},
                           new string[] {"Li","Be","B","C", "N", "O", "F", "Ne"},
                           new string[] {"Na","Mg","Al","Si", "P", "S", "Cl", "Ar"},
                           new string[] {"K", "Ca", "Sc", "Ti", "V", "Cr", "Mn", "Fe", "Co", "Ni", "Cu", "Zn", "Ga", "Ge", "As", "Se", "Br", "Kr"}
                        };
            return periodicTable;
        }
    }
}

VB.NET

Imports System.IO

Module Module1

    Sub Main()
        Const fileName As String = "VBNetImportFromJaggedArray.xls"

        'Create a new spreadsheet
        Dim spreadsheet As Bytescout.Spreadsheet.Spreadsheet = New Bytescout.Spreadsheet.Spreadsheet

        'Get the data from the jagged array that we want to import
        Dim periodicTable()() As String = GetJaggedArray()

        'Import data into spreadheet
        spreadsheet.ImportFromJaggedArray(periodicTable)

        'Save the spreadsheet
        If (File.Exists(fileName)) Then
            File.Delete(fileName)
        End If
        spreadsheet.SaveAs(fileName)

        'Close spreadsheet
        spreadsheet.Close()

        'Open the spreadsheet
        Process.Start(fileName)
    End Sub

    ''' <summary>
    ''' Creates a jagged array of the period table of elements
    ''' </summary>
    ''' <returns>Jagged array of the periodic table of elements</returns>
    Function GetJaggedArray() As String()()

        Dim periodicTable = {
            New String() {"H", "He"},
            New String() {"Li", "Be", "B", "C", "N", "O", "F", "Ne"},
            New String() {"Na", "Mg", "Al", "Si", "P", "S", "Cl", "Ar"},
            New String() {"K", "Ca", "Sc", "Ti", "V", "Cr", "Mn", "Fe", "Co", "Ni", "Cu", "Zn", "Ga", "Ge", "As", "Se", "Br", "Kr"}
            }

        Return periodicTable
    End Function

End Module