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Note checkTwoOrMoreCandidates() uses a random function to pass in a varying number of address candidates. Test purists might find this worrying, as it means the test could potentially pass or fail randomly each time it s run. This would be worrying if the random input potentially crossed the range between correct and incorrect data. However, as long as the random values can fall only within a correct (sunny day) range or an incorrect (rainy day) range, it s a valid way to eke out unexpected test failures. Also see the section previously on fuzzing, and constrained random testing.

set { txtTimestamp.Text = BitConverter.ToString((byte[])value); } } This code uses a BitConverter to transform the byte array received from the database into a string, and then uses the Convert.ToByte method to transform it back into a byte array for populating a parameter value to send to the database. By typing it as an Object, consumers of the control need not worry about their parameter values. They can set it with code like this (user control instance is named tsAuthor): tsAuthor.TimestampValue = cm.Parameters["@ts"].Value; And they can retrieve the value with this line of code: pm = cm.Parameters.Add("@ts", SqlDbType.Timestamp); pm.Value = tsAuthor.TimestampValue; This is the type of programming ease you re designing for by encapsulating this logic in the user control. So when the page first renders, you populate the author list. You ve done this several times, so this code is omitted here for brevity. You can see from the markup that when the user chooses an entry from the list, a postback occurs (AutoPostBack=true), and the BindToAuthor method is executed (from Concurrency3.aspx). protected void BindToAuthor(object sender, EventArgs e) { SqlConnection cn = new SqlConnection( ConfigurationManager.ConnectionStrings ["localPubs"].ConnectionString); SqlCommand cm = new SqlCommand( "select @fname = au_fname, @lname = au_lname, @ts = ts " + "from authors_ts where au_id = @id", cn); cm.Parameters.Add("@id", SqlDbType.Char, 11) .Value = ddlAuthors.SelectedValue; cm.Parameters.Add("@fname", SqlDbType.VarChar,20) .Direction = ParameterDirection.Output; cm.Parameters.Add("@lname", SqlDbType.VarChar,40) .Direction = ParameterDirection.Output; cm.Parameters.Add("@ts", SqlDbType.Timestamp) .Direction = ParameterDirection.Output; cn.Open(); cm.ExecuteNonQuery(); cn.Close();

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}; "Visa" };

}; "Visa" };

txtFirstName.Text = cm.Parameters["@fname"].Value.ToString(); txtLastName.Text = cm.Parameters["@lname"].Value.ToString(); tsAuthor.TimestampValue = cm.Parameters["@ts"].Value; pnEdit.Visible = true; } Notice how you re retrieving values using output parameters built right into our command text. This statement is executed with ExecuteNonQuery, which means the overhead of creating a result set is never incurred. This data access method is screaming fast, especially for dynamically generated SQL. You get the timestamp value back as an output parameter as well, and pass it right along to your user control, leaving it typed as an Object (basically untyped). This is fine, because the user control knows it s a byte array and converts to a string for streaming to the client. The user can now edit to his heart s content, and when done, click the Save button. Here you re using dynamic SQL with parameters built in again, but this time they re all input parameters (again, from Concurrency3.aspx). protected void btnSave_Click(object sender, EventArgs e) { SqlConnection cn = new SqlConnection( ConfigurationManager.ConnectionStrings ["localPubs"].ConnectionString); SqlCommand cm = new SqlCommand( "update authors_ts set au_fname = @fname, " + "au_lname = @lname where au_id = @id " + "and ts = @ts", cn); cm.Parameters.Add("@id", SqlDbType.Char, 11) .Value = ddlAuthors.SelectedValue; pm = cm.Parameters.Add("@ts", SqlDbType.Timestamp); pm.Value = tsAuthor.TimestampValue; cm.Parameters.Add("@fname", SqlDbType.VarChar, 20) .Value = txtFirstName.Text; cm.Parameters.Add("@lname", SqlDbType.VarChar, 40) .Value = txtLastName.Text; cn.Open(); int i = cm.ExecuteNonQuery(); cn.Close(); if (i == 1) lblOutput.Text = "Data saved"; else lblOutput.Text = "Concurrency error"; pnEdit.Visible = false; BindList(); }

Another quick run of the test runner produces a green bar as you d expect really, since the code under test (so far) is just a one-liner. The next test case is a little more complicated, though.

using (var context = new EFRecipesEntities()) { var customers = context.Customers.Where(c => c.City == "Raytown"); var creditCards = customers.SelectMany(c => c.CreditCards); var transactions = creditCards.SelectMany(cr => cr.Transactions); // execute queries, EF fixes up associations customers.ToList(); creditCards.ToList(); transactions.ToList(); foreach (var customer in customers) { Console.WriteLine("Customer: {0} in {1}", customer.Name, customer.City); foreach (var creditCard in customer.CreditCards) { Console.WriteLine("\tCard: {0} expires on {1}", creditCard.CardNumber, creditCard.ExpirationDate.ToShortDateString()); foreach (var trans in creditCard.Transactions) { Console.WriteLine("\t\tTransaction: {0}", trans.Amount.ToString("C")); } } } } The following is the output of the code in Listing 13-15: Customer: Robin Rosen in Raytown Card: 41949494338899 expires on 12/1/2010 Transaction: $29.95 Customer: Bill Meyers in Raytown Card: 41238389484448 expires on 12/1/2013 Transaction: $83.39

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