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To navigate programmatically, you need to access the form s BindingContext object, find the correct CurrencyManager, and modify its Position property. Unfortunately, to find the correct CurrencyManager object, you need to submit the data object you used for your binding. That means you need to keep track of the data object in a form-level variable, or look up the CurrencyManager immediately after you perform the binding and track it in a form-level variable. The following example demonstrates the second technique. First, create the variable for storing the CurrencyManager object: // This is a CurrencyManager, but we don't need to perform a cast because // the BindingManagerBase exposes all the properties we need to use. private BindingManagerBase storeBinding; Next, in the Form.Load event handler create the bindings and store a reference to the binding object. The only new line is highlighted in bold. private void MultipleControlBinding_Load(object sender, System.EventArgs e) { // Get table. DataTable dt = Program.StoreDB.GetProducts(); // Set up bindings. cboModelName.DataSource = dt; cboModelName.DisplayMember = "ModelName"; lblModelNumber.DataBindings.Add("Text", dt, "ModelNumber"); lblUnitCost.DataBindings.Add("Text", dt, "UnitCost"); lblDescription.DataBindings.Add("Text", dt, "Description");

If you make other changes to the schema, or run the tests against different data sets, you dilute the test result, and you cannot reliably state that the difference in the benchmark results is due to the change in the product key s data type Likewise, if you are testing to determine the impact of a SQL statement s performance given a twentyfold increase in the data set s size, the only difference between the two benchmarks should be the number of rows being operated upon Because it takes time to set up and to run benchmarks, you ll often be tempted to take shortcuts Let s say you have a suspicion that if you increase the key_buffer_size, query_ cache_size, and sort_buffer_size server system variables in your mycnf file, you ll get a big performance increase.

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// Keep track of the currency manager. storeBinding = this.BindingContext[dt]; } Now you can control the position through the storeBinding member variable. Here s an example with Previous and Next buttons that allow the user to browse through the data (see Figure 8-16): private void cmdPrev_Click(object sender, System.EventArgs e) { storeBinding.Position--; } private void cmdNext_Click(object sender, System.EventArgs e) { storeBinding.Position++; }

Figure 2-6. Example of a distributed transaction During development, it is sometimes difficult to know whether a transaction will be local or distributed as this depends on the way the databases are deployed in production. Developers would try

As it stands, the navigation controls harmlessly fail to work if you try to browse past the bounds of the data source (for example, click the Previous button on the first record). However, a more intuitive approach would be to disable the controls at this position. You can accomplish this by reacting to the Binding.PositionChanged event. First, you connect the event handler (after binding the data source): storeBinding = this.BindingContext[dt]; storeBinding.PositionChanged += new EventHandler(Binding_PositionChanged); The PositionChanged event doesn t provide you with any useful information (such as the originating page). But it does allow you to respond and update your controls accordingly. In the example below, the previous and next buttons are disabled when they don t apply.

So, you run the test with and without those variable changes, and find you re absolutely right! The test showed a performance increase of 4% over the previous run You ve guessed correctly that your changes would increase throughput and performance, but, sadly, you re operating on false assumptions You ve assumed, because the test came back with an overall increase in performance, that increasing all three system variable values each improves the performance of the application What if the changes to the sort_buffer_size and query_cache_size increased throughput by 5%, but the change in the key_buffer_size variable decreased performance by 1% You wouldn t know this was the case So, the bottom line is that you should try to isolate a single changed variable in your tests..

private void Binding_PositionChanged(object sender, System.EventArgs e) { if (storeBinding.Position == storeBinding.Count - 1) { cmdNext.Enabled = false; } else { cmdNext.Enabled = true; } if (storeBinding.Position == 0) { cmdPrev.Enabled = false; } else { cmdPrev.Enabled = true; } } If you want to be able to track the previous record, you need to add a form-level variable, and track it in the PositionChanged event handler. This technique has a few interesting uses, including validation (which you examine later in this chapter). private int currentRecord; private void Binding_PositionChanged(object sender, EventArgs e) { // At this point, currentPage holds the previous page number. // Now we update currentPage: currentRecord = storeBinding.Position; }

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