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The available templates are as follows: Sequential Workflow Console Application: This contains a simple sequential workflow and the code for a Windows console application that can host it. Sequential Workflow Library: This contains a simple sequential workflow that can be published as an activity or a web service. Workflow Activity Library: This allows you to create a new activity for the WF Toolbox. State Machine Workflow Console Application: This contains a state machine workflow and the code for a Windows console application that can host it. State Machine Workflow Library: This contains a simple state machine workflow that can be published as an activity or a web service. Empty Workflow Project: This provides a simple workspace that allows you to add your own workflow application types. You can experiment with these to find the template that best suits you. For this example, you will step through building a simple sequential workflow console

Deleting an <employee> node requires finding it from the list of available employees based on the employee ID and then removing it from the document. The code that implements the delete feature is given in Listing 2-15.

Portlets may flush the content stored in a partially full buffer to the user s web browser with the flushBuffer() method. Any errors while writing content will cause flushBuffer() to throw an IOException. This method commits the response, which means that the portal sent content to the user s web browser.

application called FirstWorkFlowApp (see Figure 9-1). And, yes, if you were wondering this will be a Hello World application! When you create this application using the template, you ll be taken to the Visual Studio IDE with the Workflow Designer open, and the set of available activities open in the Toolbox (see Figure 9-2).

To determine if the response is committed, the RenderResponse interface provides the isCommitted() method, which returns true if content has already been sent.

Listing 2-15. Deleting a Node private void button3_Click(object sender, EventArgs e) { XmlNode node = doc.SelectSingleNode("//employee[@employeeid='" + comboBox1.SelectedItem + "']"); if (node != null) { doc.DocumentElement.RemoveChild(node); } doc.Save(Application.StartupPath + "/employees.xml"); UpdateLabel(); } The code retrieves the node that we wish to delete by using the SelectsSingleNode() method. To delete a node from the ChildNodes collection, the XmlNode class provides a method called RemoveChild(). The RemoveChild() method accepts a reference to the XmlNode that is to be removed from the ChildNodes collection. In our case, we wish to remove the entire <employee> node, which is a child node of the <employees> root element. Hence the code calls the RemoveChild() method on the DocumentElement, that is, the root node of the document. After the node is deleted, the file is saved to disk by using the Save() method of the XmlDocument class. The UpdateLabel() helper method simply updates the current record number displayed on the status label.

4

This is another useful debugging and optimization tool. When set to true, it shows the areas of the plug-in that are being redrawn with each frame.

The code that adds a new employee is a bit lengthier than our previous examples. It is more interesting too. You will now learn how to create XML document contents from the ground up. Creating elements, attributes, text nodes, and CDATA sections will all be demystified in this section. First of all, let s count the elements, attributes, and nodes that we need to create in order to add a new employee to our XML document. Here is a list of nodes that we need to add: An <employee> element A <firstname> element A <lastname> element A <homephone> element A <notes> element An employeeid attribute for the <employee> element A text node for the <firstname> value A text node for the <lastname> value A text node for the <homephone> value A CDATA section for the <notes> value

public boolean isCommitted()

Silverlight offers a number of events that you can use to manage application events such as loading, unloading, and full screen changes.

If the response has not yet been committed, the portlet can reset the response, or just the content in the buffer. The reset() method throws away any response properties and the content in the response s buffer. If the portlet would like to keep the properties and just remove the content, it can use the resetBuffer() method.