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bool IsCategoryNode(TreeNode theNode) { // category nodes are at the root level return theNode.Parent == null; } void UpdateOptionsCost() { ArrayList optionsSelected = new ArrayList(); // get a list of all the selected options foreach (TreeNode categoryNode in treeViewOptions.Nodes) foreach (TreeNode optionNode in categoryNode.Nodes) if (optionNode.Checked) optionsSelected.Add(optionNode.Tag); // get total cost of options and show result PricedItem[] options = optionsSelected.ToArray(typeof(PricedItem)) as PricedItem[]; decimal totalPrice = FireComputeCostOfOptions(options); labelTotalPrice.Text = totalPrice.ToString("C"); // display as a currency } private void buttonSubmit_Click(object sender, System.EventArgs e) { ArrayList options = new ArrayList(); foreach (TreeNode categoryNode in treeViewOptions.Nodes) foreach (TreeNode optionNode in categoryNode.Nodes) if (optionNode.Checked) options.Add(optionNode.Tag); PricedItem[] items = options.ToArray(typeof(PricedItem)) as PricedItem[]; Color color = Color.FromName(comboBoxColor.Text); FireSubmitOrder(comboBoxModel.Text, comboBoxStyle.Text, color, items); } public delegate string[] GetStylesHandler(string theModel); public event GetStylesHandler OnGetStyles; string[] FireGetStyles(string theModel) { if (OnGetStyles == null) return null; return OnGetStyles(theModel); } public delegate Color[] GetColorsHandler(string theModel, string theStyle); public event GetColorsHandler OnGetColors; Color[] FireGetColors(string theModel, string theStyle) { if (OnGetColors == null) return null; return OnGetColors(theModel, theStyle); }

When you install the Oracle Client software, you have four options: Administrator: Lets applications connect to local or remote Oracle databases and administer them as well Runtime: Lets you connect to local or remote Oracle databases Custom: Lets you select individual components from the Administrator and Runtime installation components Instant Client: Installs only the shared libraries required by Oracle Call Interface (OCI), Oracle C++ Call Interface (OCCI), and Java Database Connectivity OCI applications

Here s how you install the Oracle Client software: 1. Insert the Oracle Database 11g Client CD in the CD drive, or run the runInstaller script from your staging directory, as shown in 9. 2. Select Install/Deinstall Products, and click Next. 3. The Welcome window is displayed. Click Next. 4. In the Specify File Locations page, accept the default file directory or enter an Oracle home name and directory path. Click Next. 5. In the Select Installation Type screen, you re offered four choices Instant Client, Administrator, Runtime, or Custom. Select Runtime Installation from the list, and click Next. 6. Review the components of the Runtime install, and click Install. 7. After the installation of the Oracle Client software is completed, the Oracle Net Configuration Assistant will appear. Select the No, I Will Create Service Names Myself option, and click Next. 8. Under Database SID, enter your database name, and click Next. 9. Select TCP as the protocol, and click Next. 10. Under Host Name, enter your host server name, and select the standard port. Click Next. 11. Click the Yes button to test the connectivity, and click Next. 12. When you see the message, Connecting . . . Test Successful, click Next. 13. Select No when asked if you would like to configure another service. Click Next. 14. Confirm the completion of the Net Service Name configuration by clicking Next. 15. Click Finish and Exit.

If there are multiple Oracle installations on a PC, there may be several tnsnames.ora files on the system as well. A user may be unable to connect to a new database after adding the network configuration information to a tnsnames.ora file if it s not the one in use. Make sure the correct tnsnames.ora file is in the Oracle Client s path.

public delegate ArrayList GetOptionsHandler(string theModel, string theStyle); public event GetOptionsHandler OnGetOptions; ArrayList FireGetOptions(string theModel, string theStyle) { if (OnGetOptions == null) return null; return OnGetOptions(theModel, theStyle); } public delegate void SubmitOrderHandler(string theModel, string theStyle, Color theColor, PricedItem[] theOptions); public event SubmitOrderHandler OnSubmitOrder; void FireSubmitOrder(string theModel, string theStyle, Color theColor, PricedItem[] theOptions) { if (OnSubmitOrder != null) OnSubmitOrder(theModel, theStyle, theColor, theOptions); } public delegate decimal ComputeCostOfOptionsHandler(PricedItem[] theOptionsSelected); public event ComputeCostOfOptionsHandler OnComputeCostOfOptions; decimal FireComputeCostOfOptions(PricedItem[] theOptionsSelected) { if (OnComputeCostOfOptions == null) return 0; return OnComputeCostOfOptions(theOptionsSelected); } } // class CoordinatorOrderEntry public class CoordinatorOrderEntry { public Color[] GetColors(string theModel, string theStyle) { return FireGetColors(theModel, theStyle); } // each entry in the returned ArrayList is a PriceItem[] public ArrayList GetOptions(string theModel, string theStyle) { return FireGetOptions(theModel, theStyle); } public string[] GetStyles(string theModel) { return FireGetStyles(theModel); }

You can bypass the use of an Oracle Net name by setting the TWO_TASK environment variable (on UNIX/Linux) or the LOCAL environment variable (on Windows). The TWO_TASK environment variable specifies the connect string for connecting to a remote machine. SQL*Net will check the value of the TWO_TASK environment variable and automatically add it to your connect string, as shown in the following example: $ export TWO_TASK=mydb Once you set the TWO_TASK environment variable, you can connect to the mydb database in the following way: $ sqlplus scott/tiger Note that you didn t have to use the specification sqlplus scott/tiger@mydb, since you re using the TWO_TASK variable. On a Windows server, the following is the equivalent for setting the TWO_TASK environment variable: $ SET LOCAL=<mydb> $ sqlplus scott/tiger