Fastest way of performing Bulk Update in C# / .NET

Question

I'm trying to figure out whats the best possible way to perform a bulk update via my mini console application in SQL server. I have written my own way of bulk update like following:

  SqlCommand command = new SqlCommand();
  command.Connection = new SqlConnection("Data Source=.;Initial Catalog=mydb;Integrated Security=SSPI");
  command.Connection.Open();

  for (int i = 0; i < items.Count; i = i + 1000)
  {
     var batchList = items.Skip(i).Take(1000).ToList();
     for (int j = 0; j < batchList.Count(); j++)
     {
       command.CommandText += string.Format("update Items set QuantitySold=@s_id{0} where ItemID = @id{0};", j);
       command.Parameters.AddWithValue("@s_id" + j, batchList[j].QuantitySold);
       command.Parameters.AddWithValue("@id" + j, batchList[j].ItemID);
      }
     command.ExecuteNonQuery();
     command = new SqlCommand();
     command.Connection = new SqlConnection("Data Source=.;Initial Catalog=mydb;Integrated Security=SSPI");
     command.Connection.Open();
            }
     command.Connection.Close();

But I'm not so happy with the performance of this one, updating 50000-100000 records in my DB gets quite slow when doing it like this, even tho it does them in batches of 1000....

Is there any library/solution out there that could "speed things up"?

Can someone help me out ?

Answer 1

The fastest way would be to bulk insert the data into temporary table using the built in SqlBulkCopy Class, and then update using join to that table

Or you can use a tool such as SqlBulkTools which does exactly this in an easy way.

var bulk = new BulkOperations();

using (TransactionScope trans = new TransactionScope())
{
    using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=mydb;Integrated Security=SSPI")
    {
        bulk.Setup()
            .ForCollection(items)
            .WithTable("Items")
            .AddColumn(x => x.QuantitySold)
            .BulkUpdate()
            .MatchTargetOn(x => x.ItemID) 
            .Commit(conn);
    }

    trans.Complete();
}