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storeBinding.PositionChanged += new EventHandler(Binding_PositionChanged); dt.ColumnChanged += new DataColumnChangeEventHandler(TableChanged); Next, you make the record navigation conditional on the current record being valid. If the errFlag member variable is set to true, the user is automatically sent back to the original page. private void Binding_PositionChanged(object sender, System.EventArgs e) { if (errFlag) { // Reset the page. storeBinding.Position = currentPage; } else { // Allow the page to change and update the currentPage variable. currentRecord = storeBinding.Position; } } Next, you add the validation code, which occurs in response to a table change. This event is fired when the user tabs to a new field after making a modification or tries to browse to a new record after making a modification. It always occurs before the PositionChanged event. private void TableChanged(object sender, System.Data.DataColumnChangeEventArgs e) { string errors = Program.StoreDB.ValidateProduct(e.Row); if (errors.Length == 0) { errFlag = false; } else { errFlag = true; } lblErrorSummary.Text = errors; } You ll notice that this form doesn t contain any database-specific code. Instead, the validation is performed by passing the current row to a special method provided by our database wrapper class. This method returns an error string or an empty string if the validation succeeded. public string ValidateProduct(DataRow row) { string errors = string.Empty; if (((decimal)row["UnitCost"]) <= 0) { errors += "* UnitCost value too low\n"; }

A process can be described as an executing set of instructions the operating system has allocated an address space in which to conduct its operations. The operating system grants the process control over various resources, like files and devices. The operations conducted by the process have been given a certain priority by the operating system, and, over the course of its execution, the process maintains a given state (sleeping, running, and so on).

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{ Stopwatch _stopwatch = new Stopwatch(); String _Results; try { //Retrieve 10,000 products with statement caching disabled //Setting a cache size of 0 automatically disables the statement cache String _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;Statement Cache Size=0;Self Tuning=false;"; OracleConnection _connObj = new OracleConnection(_connstring); _connObj.Open(); OracleCommand _cmdObj = _connObj.CreateCommand(); _stopwatch.Start(); _cmdObj.CommandText = "SELECT * FROM Products WHERE ID=:IDValue"; OracleParameter _paramObj = _cmdObj.Parameters.Add("IDValue",OracleDbType.Varchar2); for (int i = 1; i <= 10000; i++) { _paramObj.Value = "E" + Convert.ToString(i); OracleDataReader _rdrObj = _cmdObj.ExecuteReader(); _rdrObj.Dispose(); } _stopwatch.Stop();

public void PicDoubleClick(object sender, EventArgs e) { // Find the related control. Control ctrl = null; foreach (KeyValuePair<Control, PictureBox> item in pictures) { if (item.Value == sender) { ctrl = item.Key; break; } } // Show the help. if (ctrl != null) { Help.ShowHelp(ctrl, helpFile, HelpNavigator.Topic, contextIDs[ctrl]); } } It s important to note that if you don t have a valid Help file and context identifier, nothing will happen when you double-click the help icon. For this reason, the version of this example included with the code download at www.apress.com uses a message box to let you know the event has been detected. You can find out much more about the Help class this control uses to invoke the Help engine in 23. To invoke this control, just specify a global Help file for the provider and set a Help context ID for a specific control, using either the Properties window or code like this: helpIconProvider1.HelpFile = "myhelp.hlp"; helpIconProvider1.SetHelpID(TextBox1, "10001"); helpIconProvider1.SetHelpID(TextBox2, "10002"); Figure 25-4 shows the HelpIconProvider in action.

Tip By now, you ve probably recognized that a lot of infrastructure is shared in almost every extender provider. To deal with this in a more elegant way, you could create a base class for extender providers that implements the registration pattern shown in the HelpIconProvider. Then to create a custom provider you would simply need to override the Register() and UnRegister() methods to hook into your desired event, and the CanExtend() method to choose the controls you support. The process of tracking controls and adding them to the collection can be abstracted away, simplifying the model.

6. Certain components and libraries, however, will still interact directly with the operating system or hardware where performance or other benefits may be realized.

You now have all the basic software set up to write your first ODP.NET application. In this chapter, you will explore the different ways to connect to an Oracle database using ODP.NET and the various connection parameters you can use to control ODP.NET behavior. Specifically, we will explore the following: How Transparent Network Substrate (TNS) works How you can build connection strings dynamically instead of hard-wiring them into your code How to utilize Oracle s transparent application failover feature to build robust applications that continue to work even when database connections drop midway in your code

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