Question

I have a database table which has 2 columns and I have a List where T has 2 properties.

How can I create a transaction so that I can effectively say:

UPDATE MyTable 
SET ColumnA = List<T> 1st property 
WHERE ColumnB = List<T> 2nd Property

A transaction may not necessarily be needed if one update will get executed but if I have 100 items in my List what will be required to get this working?

Answer 1

You need to execute these update statements in a loop, looping over your list

using(var connection = new SqlConnection(connectionString)) {
    connection.Open();
    using(var transaction = connection.BeginTransaction("Transaction")) {
        foreach(var item in list) {
            using(var command = connection.CreateCommand()) {
                command.Transaction = transaction;
                command.CommandText = // set the command text using item
                command.ExecuteNonQuery();
            }
        }
        transaction.Commit();
    }
}