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an exception and ignoring it won t make it easier to troubleshoot the application. That will only leave you and your users unaware of any problems. Not all exceptions should be caught only catch exceptions that can be handled. Exceptions that can t be handled should instead fall through to SharePoint, which will eventually log the exception. There s a distinction between system exceptions and business logic errors. For instance, an Access Denied exception shouldn t always be handled; it can fall through to SharePoint, unless it s important for business logic to handle that exception. This isn t specific to SharePoint; it s good practice in all .NET development. In SharePoint with Web Parts it s important to do this correctly. A page in SharePoint can contain several Web Parts, and one single failing Web Part can make the whole page useless. One common method is to use a generic try-catch block that will catch any exception just to avoid displaying error messages to the users. Although using a trycatch block could keep the solution from displaying unwanted errors or sensitive information, this method of catching all exceptions makes users unaware of what went wrong and they ll have problems resolving or reporting the error. Being unaware of what failed in business-critical applications can be fatal. Consider an application making a financial transfer that fails and the user doesn t notice what made it fail:

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8 When deep underground heat is transferred by thermal conduction through water to the surface, it is called (A) (B) (C) (D) (E) solar energy nuclear energy wind energy geothermal energy cosmic energy

void button_Click(object sender, EventArgs e) { try { float amount = float.Parse(textBox.Text); TransferMoney(amount); } catch (Exception) { label.Text = "Transfer failed"; return; } label.Text = "Succeeded"; }

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This snippet is a response to a button click; it takes the value of a text box and parses it into a float value before it uses a method to transfer the amount of money. The generic catch statement will catch all kinds of exceptions and inform the user that the transfer failed but not why. Even worse would be just catching the exception and not doing anything. In this simple example, users won t know whether they entered an invalid value or the money transfer failed. A better approach is in this case to catch only exceptions of the type FormatException. All other exceptions will be let through to the SharePoint exception handling.

3 Impoundment, diversion, and run-of-river are all types of (A) (B) (C) (D) (E) solar cells wind turbines hydroelectric power plants canoes nuclear power plants

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To further prove the continuing evolution of wireless technologies, people are already discussing fourth-generation (4G) networks before 3G networks have even achieved significant global deployments The discussion about 4G does not foretell 3G s untimely demise; rather, it indicates that the wireless industry is continuing to drive technology evolution to support even greater data throughputs and network capacity than those offered by 3G However, 4G is closely linked to 3G In fact, interest in 4G increased immediately following the 3G radio spectrum auctions in Europe as carriers began considering alternative and potentially cheaper methods for high-speed wireless access In Japan, wireless pioneer NTT DoCoMo announced in March 2001 that they plan to offer 4G services by 2006, several years ahead of previously announced plans The main driver behind the interest in 4G networks is faster data throughput In fact, 4G networks are not necessarily entirely new technology, but a combination of existing 2G/25G/3G technologies to attain faster data throughput In a 4G environment, Bluetooth, 80211, and 2G/25G technologies could all coexist and provide the necessary capabilities for high-speed wireless Internet access This leads to the creation of so-called hotspots, confined areas in high-profile locations such as airports or hotel lobbies in which a wireless LAN network is installed and users connect to that LAN with a PC or handset and achieve high-speed access See Figure 11-2 for more details When users are removed from these hotspots, they essentially function as if they were on a 2G or 25G network The 4G approach has several significant advantages, notably to carriers:

void button_Click2(object sender, EventArgs e) { try { float amount = float.Parse(textBox.Text); TransferMoney(amount); } catch (FormatException) { label.Text = "Invalid amount format"; return;

9 Propeller-like turbine blades are used to generate electricity from (A) (B) (C) (D) (E) sunlight rain wind snow biomass

} label.Text = "Succeeded"; }

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