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} catch { throw new ApplicationException("Data error."); } } Interestingly, when you use this approach, you have exactly the same functionality at your fingertips. For example, in the next chapter you ll learn to use the ObjectDataSource to bind to custom classes. The ObjectDataSource understands custom classes and the DataSet object equally well (and they have essentially the same performance). The DataSet approach has a couple of limitations. Although the DataSet makes the ideal container for disconnected data, you may find it easier to create methods that return individual DataTable objects and even distinct DataRow objects (for example, as a return value from a GetEmployee() method). However, these objects don t have the same level of data binding support as the DataSet, so you ll need to decide between a clearer coding model (using the various disconnected data objects) and more flexibility (always using the full DataSet, even when returning only a single record). Another limitation is that the DataSet is weakly typed. That means there s no compile-time syntax checking or IntelliSense to make sure you use the right field names (unlike with a custom data access class such as EmployeeDetails). You can get around this limitation by building a typed DataSet, but it takes more work. For more information about creating a typed DataSet, refer to Pro ADO.NET 2.0 (Apress, 2005).

Although there s nothing stopping you from generating HTML by hand as you loop through disconnected data, in most cases ASP.NET data binding can simplify your life quite a bit. 9 discusses data binding in detail, but before continuing to the DataView examples in this chapter you need to know the basics. The key idea behind data binding is that you associate a link between a data object and a control, and then the ASP.NET data binding infrastructure takes care of building the appropriate output. One of the data-bound controls that s easiest to use is the GridVew. The GridView has the builtin smarts to create an HTML table with one row per record and with one column per field. To bind data to a data-bound control such as the GridView, you first need to set the DataSource property. This property points to the object that contains the information you want to display. In this case, it s the DataSet: GridView1.DataSource = ds; Because data-bound controls can bind to only a single table (not the entire DataSet), you also need to explicitly specify what table you want to use. You can do that by setting the DataMember property to the appropriate table name, as shown here: GridView1.DataMember = "Employees"; Finally, once you ve defined where the data is, you need to call the control s DataBind() method to copy the information from the DataSet into the control. If you forget this step, the control will remain empty, and the information will not appear on the page. GridView1.DataBind(); As a shortcut, you can call the DataBind() method of the current page, which walks over every control that supports data binding and calls the DataBind() method.

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As mentioned previously, classes and functions all have a special attribute, which contains the actual string specified as the code s docstring. Unfortunately, this is formatted exactly as it was in the original source file, including extra line breaks and unnecessary indentation. To format docstrings in a more readable manner, Python s module provides another useful function, . It removes unnecessary line breaks, as well as any extra indentation that was a side effect of where the docstring was written. The removal of indentation merits a bit of explanation. Essentially, finds the leftmost non-whitespace character in the string, counts up all the whitespace between that character and the start of the line it s in, and removes that amount of whitespace from all the other lines in the docstring. This way, the resulting string is left-justified but retains any additional indents that exist for the sake of formatting the documentation.

SOAP Toolkit, a COM library that includes objects that allow you to consume web services in COMbased languages such as Visual Basic 6 and Visual C++ 6. Along with these tools, the SOAP Toolkit also includes an indispensable tracing tool for peeking under the covers at SOAP communication. To download the SOAP Toolkit, surf to http://msdn.microsoft.com/webservices/_building/ soaptk. Once you ve installed the SOAP Toolkit, you can run the trace utility by selecting Microsoft SOAP Toolkit Trace Utility from the Start menu. Once the trace utility loads, select File New Formatted Trace. You ll see the window shown in Figure 33-4.

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