Use SqlBulkCopy to data from one table to another table : SqlBulkCopy « ADO.Net « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. ADO.Net
3. SqlBulkCopy

using System;
using System.Data.SqlClient;

class Program
{
    static void Main()
    {
        string connectionString = "Data Source=(local);Integrated Security=true;Initial Catalog=AdventureWorks;";
        using (SqlConnection sourceConnection = new SqlConnection(connectionString))
        {
            sourceConnection.Open();
            SqlCommand commandRowCount = new SqlCommand("SELECT COUNT(*) FROM dbo.BulkCopyDemoMatchingColumns;",sourceConnection);
            long countStart = System.Convert.ToInt32(commandRowCount.ExecuteScalar());
            Console.WriteLine("Starting row count = {0}", countStart);

            SqlCommand commandSourceData = new SqlCommand("SELECT ProductID,Name,ProductNumber FROM Production.Product;", sourceConnection);
            SqlDataReader reader = commandSourceData.ExecuteReader();
            using (SqlConnection destinationConnection = new SqlConnection(connectionString))
            {
                destinationConnection.Open();
                using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection))
                {
                    bulkCopy.DestinationTableName = "dbo.BulkCopyDemoMatchingColumns";
                    try
                    {
                        bulkCopy.WriteToServer(reader);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                    finally
                    {
                        reader.Close();
                    }
                }
                long countEnd = System.Convert.ToInt32(commandRowCount.ExecuteScalar());
                Console.WriteLine(countEnd);
            }
        }
    }       
}