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lock (myObj) { // (Do something with myObj.) } When creating a lock, make sure you lock the smallest object with the least visibility for the shortest amount of time to ensure that other parts of the application that might also use the object aren t blocked. It s also a good idea to avoid locking multiple objects at once using nested lock statements, as this can lead to deadlock situations, in which two threads are trapped waiting for each other to release a lock they need. To see locking in action, consider the next version of the prime-number search form. Instead of showing the new results immediately when the search is finished, it shows a notification in the status bar. When the user double-clicks that panel, the data is displayed. To make this possible, you need to create a form-level variable for storing the data returned by the asynchronous worker. private string primeList = string.Empty; Now the CallAsyncWorker() method needs to store the prime-number list as soon as the operation is complete. To safeguard, this step, the primeList object is locked before it s accessed: // (Call FindPrimes() to get the prime list.) // Store the prime list in the form. lock (primeList) { primeList = sb.ToString(); } // (Invoke NotifyComplete() on the right thread to update the form.)

Another way to add new user accounts is to insert rows directly into the mysql.user table. This is a convenient way to add multiple users at once, however we don t recommend this method for just the odd user or two. To add only a few users, stick to the GRANT command. If you do insert directly into mysql.user, note the password supplied in the IDENTIFIED BY clause is actually encrypted in the mysql.user grant table. If you add the row to the user table directly, you must use the PASSWORD() function to encrypt the password: INSERT INTO mysql.user SET Host='localhost', User='some_user', Password=PASSWORD('my_password'), Select_priv='Y'; Otherwise, the connecting user would not be able to access the server, as the supplied password would be encrypted and compared to the (plain-text) Password column value in the user table. Starting in MySQL 5.0.2, you can also add users with no privileges by using the CREATE USER command. The following two statements are identical in function: CREATE USER 'some_user'@'localhost' IDENTIFIED BY 'my_password'; GRANT USAGE ON *.* TO 'some_user'@'localhost' IDENTIFIED BY 'my_password';

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MyLinkedList.MoveFirst(); while (MyLinkedList.EOF()==false) { if (MyLinkedList.GetItemByIndex(i)=='x') return true; MyLinkedList.Next(); } //Searching a collection for (i=0;<MyCollection.Count;i++) {if (MyCollection.item(i)=='x') return true;} //Searching an array for (i=0; i<UBound(MyArray);i++) { if (MyArray[i]=='x') return true;} these data structures could implement an Iterator, which could shield the underlying implementation of the search for each data structure from the programmer. The previous could thus be rewritten like so:

Tip Although this example locks a string, it s more common to lock a custom object that wraps several pieces of information. The only limit to the lock statement is that it won t work with value types (such as integers and Boolean values). You always need to wrap these inside another object.

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