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To set the tab order, you configure a control s TabIndex property. The control with a TabIndex of 0 gets the focus first. When the user presses the Tab key, the focus moves to the next control in the tab order, as long as it can accept focus. Visual Studio provides a special tool, shown in Figure 2-9, that allows you to quickly set tab order. Just select View Tab Order from the menu. You can then assign TabIndex values by clicking controls in the desired order. Label controls have a TabIndex setting even though they cannot receive focus. This allows you to use a label with an access key. When the user triggers the label s access key, the focus is automatically forwarded to the next control in the tab order. For that reason, you should give your labels an appropriate place in the tab order, especially if they use access keys. (You create an access key by placing an ampersand character before a letter in the label s text.) Controls that are invisible or disabled ( grayed out ) are generally skipped in the tab order, and are not activated regardless of the TabIndex and TabStop settings. To hide or disable a control, you set the Visible and Enabled properties, respectively. Note that if you hide or disable a control at design time, the appearance is not modified. This is a deliberate idiosyncrasy designed

{ Database _db = DatabaseFactory.CreateDatabase("ProductsDatabase"); if (_db == null) { MessageBox.Show("Failed to create the database"); } DataTable _dataTableObj = (DataTable)dgProducts.DataSource; DataSet _datasetObj = _dataTableObj.DataSet; //Create the INSERT command DbCommand _insertCommand = _db.GetStoredProcCommand("proc_InsertProduct_DAB"); _db.AddInParameter(_insertCommand, "Price", DbType.Decimal, "Price", DataRowVersion.Current); _db.AddInParameter(_insertCommand, "Name", DbType.String, "Name", DataRowVersion.Current); _db.AddInParameter(_insertCommand, "ID", DbType.String , "ID", DataRowVersion.Current); //Create the DELETE command DbCommand _deleteCommand = (DbCommand)_db.GetStoredProcCommand("proc_DeleteProduct_DAB"); db.AddInParameter(_deleteCommand, "ID", DbType.String, "ID", DataRowVersion.Current); //Create the UPDATE command

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Note If you ve programmed with Java before, the idea of layout managers is nothing new. Some of the layout managers provided for Java containers include FlowLayout (similar to a word processor), BorderLayout (which divides the screen into five zones), CardLayout (like a stack of cards layered on top of each other), GridLayout (which allows one component per equal-sized cell), and GridBagLayout (which adds support for variable control sizes and location with a grid). Although the layout ability in .NET resembles the Java approach in several ways, it also provides much more impressive design-time support.

ID of the user connection thread Authenticated user Authenticating host Name of database or NULL for requests not executing database-specific requests (like SHOW FULL PROCESSLIST) Usually either Query or Sleep, corresponding to whether the thread is actually performing something at the moment The amount of time in seconds the thread has been in this particular state (shown in the next field) The status of the thread s execution (discussed in the following text) The SQL statement executing, if you ran your SHOW FULL PROCESSLIST at the time when a thread was actually executing a query, or some other pertinent information

As you ve seen, the .NET forms architecture provides support for laying out controls using coordinates in a grid. This approach, combined with the built-in support for docking and anchoring, gives developers a rich layout environment. However, there are times when the use of the Dock and Anchor properties alone is not necessarily the best approach. For example, you may need a container control that automatically lays out child controls according to different rules, perhaps adjusting them to accommodate the width of the largest control or shrinking them to fit the size of the container, to name just two possibilities. The basic starting point in extending control layout is the Control.Layout event (or, equivalently, the Control.OnLayout() method). This event occurs in container controls and forms when they need to update the position or size of their child controls. Several factors can trigger the Layout event, including when child controls are added or removed, when a child control is resized or moved, and when the bounds of the container are changed.

DbCommand _updateCommand = (DbCommand)_db.GetStoredProcCommand("proc_UpdateProduct_DAB"); _db.AddInParameter(_updateCommand, "Price", DbType.Decimal, "Price", DataRowVersion.Current); _db.AddInParameter(_updateCommand, "Name", DbType.String, "Name", DataRowVersion.Current); _db.AddInParameter(_updateCommand, "ID", DbType.String, "ID", DataRowVersion.Current); int _rowsUpdated = _db.UpdateDataSet (_datasetObj,"Products",_insertCommand, _updateCommand ,_deleteCommand, UpdateBehavior.Standard ); MessageBox.Show(_rowsUpdated.ToString() + " row(s) updated"); }

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