System.Data.Common.DbConnection.BeginTransaction C# (CSharp) Method

        public DbTransaction BeginTransaction() =>
            BeginDbTransaction(IsolationLevel.Unspecified);

		public static int Profile_DeleteProfiles(DbConnection connection, string applicationName, string [] userNames)
		{
			int deletedUsers = 0;
			string appId = DerbyApplicationsHelper.GetApplicationId (connection, applicationName);
			if (appId == null)
				return 0;

			OleDbTransaction trans = (OleDbTransaction) connection.BeginTransaction ();
			try {
				foreach (string username in userNames) {
					string userId = GetUserId (connection, trans, appId, username);
					if (userId == null)
						continue;

					string queryDelete = "DELETE FROM aspnet_Profile WHERE UserId = ?";
					OleDbCommand cmdDelete = new OleDbCommand (queryDelete, (OleDbConnection) connection);
					cmdDelete.Transaction = trans;
					AddParameter (cmdDelete, "UserId", userId);
					cmdDelete.Transaction = trans;
					deletedUsers += cmdDelete.ExecuteNonQuery ();
				}
				trans.Commit ();
				return deletedUsers;
			}
			catch (Exception e) {
				trans.Rollback ();
				throw e;
			}
		}