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As touched upon in the previous chapter, aesthetics are an important feature of any web application. As a developer, you may be more concerned about functionality, but at the same time you can t overlook consistency of appearance in your web pages. This can seem to be a complex task, as any web application consists of up to dozens of web pages or web forms; and if you try to apply a common look and feel to an individual web page, you can imagine how tedious a task it would become for you, and whoever else is working on your application, to ensure that all web pages have a consistent look and feel. ASP .NET has a solution to this important need for consistency among all the web pages in your web application, and this feature is known as Master Pages. In your web application, you will define one Master Page with the look and feel you want that all other web pages must inherit. The Master Page also contains a content page embedded inside it. The look and feel will be applied to the Master Page portion, and the content of child pages will be merged inside the content page area. The content page is represented in the form of a ContentPlaceHolder control, which is added automatically whenever you create a Master Page.

with the devices you are using. Optimizing an Ubuntu system by tuning these files is specialist work, but let s just give you one example, which is about the scheduler. The scheduler is the kernel component that handles I/O requests. Basically, the scheduler can do only one thing at a time: it can read data blocks, or it can write them. As an administrator, you can specify what it should do. The scheduler setting is applied to each device that is installed in your computer. For your hard disk, which in most cases uses the name /dev/sda, you can find the setting in the file /sys/block/sda/queue/scheduler. To display the current contents of this file, use the command cat /sys/block/sda/queue/scheduler: root@texas:/sys/block/sda/queue# cat scheduler noop anticipatory deadline [cfq] As you can see, in the file you can use four different values: noop: The scheduler doesn t do anything with I/O but gives it directly to the I/O controller. This is a useful setting if your computer uses a fast RAID controller. anticipatory: If the scheduler gets a request to read a block, it will read ahead the next couple of blocks. This optimizes your computer to do fast reads. deadline: The scheduler will wait as long as it can to write data to disk. By doing this, it can write the data as efficient as possible, which will make writes on your computer faster. cfq (complete fair queueing): This value does nothing to optimize I/O on the scheduler, which gives an equal share to read and write requests.

By default, the scheduler is set to cfq, which makes sense for desktop systems. If however you are reading data most of the time, your computer s performance will benefit from selecting the anticipatory setting. On the other hand, a computer that writes more than that it reads (which is typically not the case for a desktop computer) will benefit from setting the deadline option. To change the setting from the command line you need to echo the new value into the configuration file. To do this, using root permissions, use for example echo anticipatory > /sys/block/sda/queue/scheduler. This immediately applies the new value: root@texas:/sys/block/sda/queue# echo anticipatory > scheduler After doing this, start some intensive read activity on your computer (like watching a movie file that is installed on your hard disk). You might see some improvement.

DO.NET is a technology for accessing and manipulating databases. Disconnected data access and XML integration are the key features of ADO.NET. In this chapter, you are going to see how ADO.NET has harnessed the power of XML in data representation. Specifically, this chapter covers the following: An overview of XML integration in ADO.NET Working with SqlDataReader and XML DataSet architecture and disconnected data access XML integration in DataSet The XmlDataDocument class

After using Ubuntu for some time, you might find that the disk begins to fill up. You can keep an eye on disk usage by clicking System Administration System Monitor and looking under the File Systems tab or using the following command in a terminal window: df -h Either method will show the free space in terms of megabytes or gigabytes for each partition, also expressed as a percentage figure. If the disk does start to get full, you can take steps to make more space available.