SqlBulkCopy Constructor (SqlConnection)


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Initializes a new instance of the SqlBulkCopy class using the specified open instance of SqlConnection.

Namespace:   System.Data.SqlClient
Assembly:  System.Data (in System.Data.dll)

public SqlBulkCopy(
	SqlConnection connection


Type: System.Data.SqlClient.SqlConnection

The already open SqlConnection instance that will be used to perform the bulk copy operation. If your connection string does not use Integrated Security = true, you can use SqlCredential to pass the user ID and password more securely than by specifying the user ID and password as text in the connection string.

Because the connection is already open when the SqlBulkCopy instance is initialized, the connection remains open after the SqlBulkCopy instance is closed.

If the connection argument is null, an ArgumentNullException is thrown.

The following console application demonstrates how to bulk load data using a connection that is already open. In this example, a SqlDataReader is used to copy data from the Production.Product table in the SQL ServerAdventureWorks database to a similar table in the same database. This example is for demonstration purposes only. You would not use SqlBulkCopy to move data from one table to another in the same database in a production application. Note that the source data does not have to be located on SQL Server; you can use any data source that can be read to an IDataReader or loaded to a DataTable.


This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. This code is provided to demonstrate the syntax for using SqlBulkCopy only. If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data.

using System.Data.SqlClient;

class Program
    static void Main()
        string connectionString = GetConnectionString();
        // Open a sourceConnection to the AdventureWorks database.
        using (SqlConnection sourceConnection =
                   new SqlConnection(connectionString))

            // Perform an initial count on the destination table.
            SqlCommand commandRowCount = new SqlCommand(
                "SELECT COUNT(*) FROM " +
            long countStart = System.Convert.ToInt32(
            Console.WriteLine("Starting row count = {0}", countStart);

            // Get data from the source table as a SqlDataReader.
            SqlCommand commandSourceData = new SqlCommand(
                "SELECT ProductID, Name, " +
                "ProductNumber " +
                "FROM Production.Product;", sourceConnection);
            SqlDataReader reader =

            // Open the destination connection. In the real world you would 
            // not use SqlBulkCopy to move data from one table to the other 
            // in the same database. This is for demonstration purposes only.
            using (SqlConnection destinationConnection =
                       new SqlConnection(connectionString))

                // Set up the bulk copy object. 
                // Note that the column positions in the source
                // data reader match the column positions in 
                // the destination table so there is no need to
                // map columns.
                using (SqlBulkCopy bulkCopy =
                           new SqlBulkCopy(destinationConnection))
                    bulkCopy.DestinationTableName =

                        // Write from the source to the destination.
                    catch (Exception ex)
                        // Close the SqlDataReader. The SqlBulkCopy
                        // object is automatically closed at the end
                        // of the using block.

                // Perform a final count on the destination 
                // table to see how many rows were added.
                long countEnd = System.Convert.ToInt32(
                Console.WriteLine("Ending row count = {0}", countEnd);
                Console.WriteLine("{0} rows were added.", countEnd - countStart);
                Console.WriteLine("Press Enter to finish.");

    private static string GetConnectionString()
        // To avoid storing the sourceConnection string in your code, 
        // you can retrieve it from a configuration file. 
        return "Data Source=(local); " +
            " Integrated Security=true;" +
            "Initial Catalog=AdventureWorks;";

.NET Framework
Available since 2.0
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