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To create your smart tag, you need to build a DesignerActionItemCollection that combines your group of DesignerActionItem objects. Order is important in this collection, because Visual Studio will add the DesignerActionItem objects to the smart tag from top to bottom in the order they appear. To build your action list, you override the DesignerActionList.GetSortedActionItems() method, create the DesignerActionItemCollection, add each DesignerActionItem to it, and then return the collection. Depending on the complexity of your smart tag, this may take several steps. The first step is to create the headers that divide the smart tag into separate regions. You can then add other items into these categories. This example uses two headers: public override DesignerActionItemCollection GetSortedActionItems() { // Create eight items. DesignerActionItemCollection items = new DesignerActionItemCollection(); // Begin by creating the headers. items.Add(new DesignerActionHeaderItem("Appearance")); items.Add(new DesignerActionHeaderItem("Information")); ... Next, you can add the properties. You specify the name of the property and the class, followed by the name that should appear in the smart tag. The last two items include the category where the item should be placed (corresponding to one of the DesignerActionHeaderItems you just created), and a description (which appears as a tooltip when you hover over that item). ... // Add items that wrap the properties. items.Add(new DesignerActionPropertyItem("ColorA", "Gradient Color A", "Appearance", "Sets the first color in the gradient."));

{ OracleConnection conn = new OracleConnection(); conn.ConnectionString = "User Id=SYSTEM;Password=admin;" + "DBA Privilege=SYSDBA;Data Source=NEWDB;"; try { conn.Open(); conn.Close(); MessageBox.Show("Connection successful!"); } catch (Exception ex) { MessageBox.Show(ex.ToString(), "Error connecting to Oracle"); } }

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items.Add(new DesignerActionPropertyItem("ColorB", "Gradient Color B", "Appearance", "Sets the second color in the gradient.")); items.Add(new DesignerActionPropertyItem("GradientFillStyle", "Gradient Fill Style", "Appearance", "Sets the blend direction for the gradient.")); ... Visual Studio connects the action item to the property in the action-item class by using reflection with the property name you supply. If you add more than one property to the same category, they re ordered based on the order in which you add them. If you add more than one category header, the categories are ordered the same way. The next step is to create a DesignerActionMethodItem(), which binds a smart tag item to a method. In this case, you specify the object where the callback method is implemented, the name of the method, the name that should appear in the smart tag display, the category where it will appear, and the tooltip description. The last parameter is a Boolean value. If true, the item will be added to the context menu for the control, as well as to the smart tag. ... items.Add(new DesignerActionMethodItem(this, "ChooseRandomColors", "Randomize colors", "Appearance", "Chooses random colors for the gradient.", true)); ... Finally, you can create new DesignerActionTextItem objects with the static text you want to show, and return the complete array of items: ... items.Add(new DesignerActionTextItem( "Location: " + linkedControl.Location.ToString(), "Information")); items.Add(new DesignerActionTextItem( "Dimension: " + linkedControl.Size.ToString(), "Information")); return items; }

st_table structs representing the .frm files. Both caches serve to minimize the amount of disk-based

Once you ve perfected your smart tag action list, you still need to connect it to your control. You accomplish this by creating a custom designer and overriding the ActionList property so that it returns an instance of your custom action-list class, as the following control designer demonstrates. Notice that the action list isn t created each time ActionList is called instead, it s cached it as private member variable to optimize performance.

There are other connection strings attributes, of course, that you can use in combination with the ones covered previously. Table 3-3 provides a list of common connection attributes for ODP.NET release 11.1.0.7.20.

It is very important to understand that the table cache does not share cached st_table structs between user connection threads. The reason for this is that if a number of concurrently executing threads are executing statements against a table whose schema may change, it would be possible for one thread to change the schema (the .frm file) while another thread is relying on that schema. To avoid these issues, MySQL ensures that each concurrent thread has its own set of st_table structs in the table cache. This feature has confounded some MySQL users in the past when they issue a request like the following: mysql> SHOW STATUS LIKE 'Open_%'; and see a result like this: +---------------+-------+ | Variable_name | Value | +---------------+-------+ | Open_tables | 200 | | Open_files | 315 | | Open_streams | 0 | | Opened_tables | 216 | +---------------+-------+ 4 rows in set (0.03 sec) knowing that they have only ten tables in their database.

public class GradientPanelDesigner : ParentControlDesigner { private DesignerActionListCollection actionLists; public override DesignerActionListCollection ActionLists { get { if (actionLists == null) { actionLists = new DesignerActionListCollection(); actionLists.Add( new GradientPanelActionList((GradientPanel)Control)); } return actionLists; } } }

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