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As you ve seen, one limitation of shaped forms is that they usually omit the nonclient title bar portion, which allows the user to easily drag the form around the desktop. There are several ways to remedy this problem. You could react to mouse events like MouseDown, MouseUp, and MouseMove, and move the form manually when the user clicks and drags (as demonstrated in 4). However, there s an even easier approach if you re willing to step outside of the .NET Framework by overriding the WndProc() method of the form. The WndProc() method fires every time the form receives a Windows message. The trick is to override this method and check for the WM_NCHITTEST message. This WM_NCHITTEST message is sent when the mouse is moved over your form, at which point you are supposed to tell Windows which part of the form the mouse is positioned above. This message is used by Windows to determine what shape it should give the cursor (such as the diagonal arrow when on the resizable bottom-right area). But more interestingly, you can return the code corresponding to the caption area, to instruct Windows to treat clicks on the client area in the same way as caption clicks in other words, the user can click and drag anywhere on the form to move it. You could add additional tests if you want to make only part of the window draggable in this way, but that s entirely up to you. The code you need isn t obvious, but it s quite short: protected override void WndProc(ref Message m) { // Allow the base class to handle all messages first. base.WndProc(ref m);

It even records data modifications that may affect data, but when executed did not for instance, a DELETE statement that found no rows to delete By enabling the binary log, you can significantly reduce the possibility of losing data on a production system The binary log works in a manner similar to what we ve described for a transaction log; however, the binary log does not ensure atomicity or consistency of your data The binary log is not a write-ahead log Records are entered into the binary log after changes to the in-memory copy of the data have been made InnoDB uses its own write-ahead system (called a double-write buffer) to ensure consistency We ll cover the InnoDB transaction system in 5.

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// Look for the WM_NCHITTEST message. int WM_NCHITTEST = 0x84; if (m.Msg == WM_NCHITTEST) { // Treat this click as a click on the caption. int HTCLIENT = 1; int HTCAPTION = 2; if (m.Result.ToInt32() == HTCLIENT) m.Result = (IntPtr)HTCAPTION; } } Now the user can click anywhere on the form and drag it around. However, the WndProc() method isn t called when you move over other controls, because they provide their own WndProc() implementation to handle this message. (Of course, workarounds are possible. For example, you could create a custom control that overrides WndProc() and returns a value of HTTRANSPARENT. This allows the form to receive the click.)

Our little sample application will try to display a list of jobs in the database. Each job will have a Person in Charge column, and its data type would be the EMPLOYEE UDT you ve created earlier. You will need to create a new relational table to store the job records. Right-click the Tables node in the Server Explorer, and choose the New Relational Table menu item to create a new relational table. Specify OVERSEAS_JOBS as the name of this table. Create the columns as

However, the binary log does allow for checkpointing and plays a role in the recovery process, where the transaction processing system inside InnoDB uses the log file in order to ensure ACID compliancy Remember that MySQL s autocommit mode means that all statements are implicitly wrapped in START TRANSACTION and COMMIT commands This means that all modifications run against the server will be recorded in the binary log as a transaction and can be rolled forward and backward as such The only thing missing is that multiple statements executed inside a START TRANSACTION and COMMIT will not be handled in a transaction-safe manner if they operate on non-transaction-safe tables Enabling the binary log functionality has a small performance impact (about 1%), which, in our opinion, is easily outweighed by the benefit it brings for enabling you to restore your database state up to immediately before a failure5 Continued.

You don t need to stop at shaped forms. You can apply similar techniques to create irregularly shaped controls. Most controls will let the background of the parent show through if you set a transparent BackColor. More powerfully, you can use the Control.Region property, which works the same as the Form.Region property, to assign a nonrectangular region to a form. Control mouse handling and control painting is performed only in the control s region. You ll see an example of irregularly shaped controls with the vector-based drawing application in 24. Controls don t provide a TransparencyKey property, although they are affected by the TransparencyKey of the form. If a control has any of the transparent color, this region of the control is made completely transparent both the control and the underlying form become invisible.

shown in Figure 15-20 . Take note that the PERSON_IN_CHARGE column should be created as an EMPLOYEE UDT.

Tip For more examples of shaped controls, check out the curved panel in the RegionMaster control sample provided by Microsoft at http://windowsforms.net/articles/ usingregionmastercontrols.aspx.

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