ByteScout Spreadsheet SDK - C# - XLS to SQL Server (via CSV BULK INSERT)

using System;
using System.IO;
using Bytescout.Spreadsheet;
using System.Data.SqlClient;
 
namespace ExportToSQLServer
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                // Load XLS document
                using (Spreadsheet document = new Spreadsheet())
                {
                    document.LoadFromFile("SimpleReport.xls");
                    string csvFile = Path.GetTempPath() + "SimpleReport.csv";
 
                    // Save the document as CSV file
                    document.Workbook.Worksheets[0].SaveAsCSV(csvFile);
                    document.Close();
 
                    if (File.Exists(csvFile))
                    {
                        // MODIFY THE CONNECTION STRING WITH YOUR CREDENTIALS!!!
                        string connectionString = "Data Source=localhost;Initial Catalog=master;Integrated Security=true;";
 
                        using (SqlConnection connection = new SqlConnection(connectionString))
                        {
                            connection.Open();
 
                            // Drop test database if exists
                            ExecuteQueryWithoutResult(connection,
                                                      "IF DB_ID ('XlsTests') IS NOT NULL DROP DATABASE XlsTests");
                            // Create empty database
                            ExecuteQueryWithoutResult(connection, "CREATE DATABASE XlsTests");
                            // Switch to created database
                            ExecuteQueryWithoutResult(connection, "USE XlsTests");
                            // Create a table for CSV data
                            ExecuteQueryWithoutResult(connection, 
                                                      "CREATE TABLE CsvTest (Name VARCHAR(40), FullName VARCHAR(255))");
                            // Export CSV data from local file
                            ExecuteQueryWithoutResult(connection,
                                                      "BULK INSERT CsvTest FROM '" + csvFile + "' " +
                                                      "WITH ( FIELDTERMINATOR = ';', ROWTERMINATOR = '\n')");
                             
                            // Check the data successfully exported
                            using (SqlCommand command = new SqlCommand("SELECT * from CsvTest", connection))
                            {
                                SqlDataReader reader = command.ExecuteReader();
 
                                if (reader != null)
                                {
                                    Console.WriteLine();
                                    Console.WriteLine("Exported CSV data:");
                                    Console.WriteLine();
 
                                    while (reader.Read())
                                    {
                                        Console.WriteLine(String.Format("{0}  |  {1}", reader[0], reader[1]));
                                    }
                                }
                            }
 
                            Console.WriteLine();
                            Console.WriteLine("Press any key.");
                            Console.ReadKey();
                        }
                    }
                }
            }
            catch(Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
                Console.ReadKey();
            }
        }
 
        static void ExecuteQueryWithoutResult(SqlConnection connection, string query)
        {
            using (SqlCommand command = new SqlCommand(query, connection))
            {
                command.ExecuteNonQuery();
            }
        }
    }
}
ByteScout Spreadsheet SDK – C# – XLS to SQL Server (via CSV BULK INSERT)

Tutorials:
