Implementation Quick Response Code in visual C HAPTE R 4 INTRODUCING THE .NET MICRO FRAM EWORK BA SE C LAS S LIBRARY

Before you can use any of the networking functionality of XNA, you should add the GamerServicesComponent to your Game.
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Another frequently asked question is, How do I retrieve the difference between two dates The answer is deceptively simple: you just subtract them. This will return a number representing the number of days between the two dates. Additionally, you have the built-in function MONTHS_BETWEEN that will return a number representing the number of months including fractional months between two dates. Lastly, with the INTERVAL types, you have yet another method to see the elapsed time between two dates. The following SQL query demonstrates the outcome of subtracting two dates (showing the number of days between them), using the MONTHS_BETWEEN function and then the two functions used with INTERVAL types: ops$tkyte%ORA11GR2> select dt2-dt1 , 2 months_between(dt2,dt1) months_btwn, 3 numtodsinterval(dt2-dt1,"day") days, 4 numtoyminterval(trunc(months_between(dt2,dt1)),"month") months 5 from (select to_date("29-feb-2000 01:02:03","dd-mon-yyyy hh24:mi:ss") dt1, 6 to_date("15-mar-2001 11:22:33","dd-mon-yyyy hh24:mi:ss") dt2 7 from dual ) 8 / DT2-DT1 MONTHS_BTWN DAYS MONTHS ---------- ----------- ------------------------------ ------------380.430903 12.5622872 +000000380 10:20:30.000000000 +000000001-00 Those are all correct values, but not of great use to us yet. Most applications would like to display the years, months, days, hours, minutes, and seconds between the dates. Using a combination of the preceding functions, we can achieve that goal. We ll select out two intervals: one for the years and months, and the other for just the day, hours, and so on. We ll use the MONTHS_BETWEEN built-in function to determine the decimal number of months between the two dates, and then we ll use the NUMTOYMINTERVAL built-in function to convert that number into the years and months. Additionally, we ll use MONTHS_BETWEEN to subtract the integer number of months between the two dates from the larger of the two dates to get down to the days and hours between them: ops$tkyte%ORA11GR2> select numtoyminterval 2 (trunc(months_between(dt2,dt1)),"month") 3 years_months, 4 numtodsinterval 5 (dt2-add_months( dt1, trunc(months_between(dt2,dt1)) ), 6 "day" ) 7 days_hours 8 from (select to_date("29-feb-2000 01:02:03","dd-mon-yyyy hh24:mi:ss") dt1, 9 to_date("15-mar-2001 11:22:33","dd-mon-yyyy hh24:mi:ss") dt2 10 from dual ) 11 / YEARS_MONTHS DAYS_HOURS --------------- -----------------------------+000000001-00 +000000015 10:20:30.000000000 Now it is clear that there is 1 year, 15 days, 10 hours, 20 minutes, and 30 seconds between the two DATEs.
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SELECT @newLastChanged = LastChanged FROM Roles WHERE Id=@id RETURN This stored procedure is called by the Role object when it needs to update the data in the database.
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design surface. Figure 2-3 shows the document outline for the login screen. This view of the logical tree is slightly different from a similar logical tree in Windows Presentation Foundation (WPF), because the document outline focuses on what is explicitly found in the XAML. For example, if a ListBoxItem contains a Content attribute, the type-converted string is not shown. However, creating a Button as a child of a ListBoxItem will cause the Button to show up in the document outline.
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Figure 18-13. Converting a decimal to an integer type
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Caution Each time the Timer s period elapses, the work method passed to the TimerCallback is invoked. This
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namespace MyImagePipeline { [ContentProcessor(DisplayName = "ExtendedExample")] public class ExtentedTextureProcessor : TextureProcessor { public override TextureContent Process(TextureContent input, ContentProcessorContext context) { TextureContent texContent = base.Process(input, context); texContent.ConvertBitmapType(typeof(PixelBitmapContent<Color>)); for (int face = 0; face < texContent.Faces.Count; face++) { MipmapChain mipChain = texContent.Faces[face]; for (int mipLevel = 0; mipLevel < mipChain.Count; mipLevel++) { PixelBitmapContent<Color> image = (PixelBitmapContent<Color>) input.Faces[face][mipLevel]; image.ReplaceColor(Color.Black, Color.White); } } return texContent; } } }
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Formatting Dates, Times, and Numbers
Now create a new class named Consultant that will implement the INotifyDataErrorInfo interface. Make sure that you add this class to the previously created folder INotifyDataErrorInfoDemo in the chapter6 Silverlight project, to keep the same structure as described here. We need to add the following namespaces: using System.ComponentModel; using System.Collections.Generic; using System.Linq; For the ease of understanding, we will divide the code into regions (#region). So let us start with the region private members (#region private members). As you can see in the code snippet, there is a ValidationService soap client proxy vds created and some private string objects to use with public properties that we will develop next. #region private members private ValidationServiceReference.ValidationServiceSoapClient vds = new ValidationServiceReference.ValidationServiceSoapClient(); private string name; private string email; private string websiteurl; #endregion Our custom error class is called ErrorInfo, with public properties and an override version of the ToString method, as shown here. Here we override the default ToString() method to a more meaningful method that outputs ErrorMessage with ErrorCode.
The hash cluster query took the same amount of CPU for all intents and purposes, even though it went to the buffer cache one-third as many times. This, too, could be anticipated. The act of performing a hash is very CPU-intensive. The act of performing an index lookup is I/O-intensive. It was a tradeoff. However, as we scale up users, we would expect the hash cluster query to scale better, as it has to get in line to access the buffer cache less frequently.
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