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try Diagnostics and error handling { connOpen(); Validation IDataReader reader = cmdExecuteReader(); _authorsDataSource = reader; Data binding _authorsDataTextField = "au_lname"; _authorsDataValueField = "au_id"; Custom controls _authorsDataBind(); } Caching finally { State management connDispose();
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} [ Team LiB ] } else { _messageText = stringFormat("You selected employee #{0}", _authorsSelectedItemValue); } } </script></head> <form runat=server> <asp:DropDownList id="_authors" runat=server /> <br/> <asp:Label id="_message" runat=server/> <br/> Table of Contents <input type=submit with Examples Essential ASPNET value="Submit" />in C# </form> ByFritz Onion </body> </html>
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Publisher Pub Date : Addison Wesley : February 11, 2003
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ISBN example, we are only populating the DropDownList control if the incoming request is the initial GET : 0-201-76040-1 In this Pages : 432 request to the page, not a subsequent POST back to the same page By default, all the data-bound controls
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retain their state across post-backs, so it is not necessary to repopulate them on a post-back Also note in this example that we are able to associate two data values with each item in the DropDownList The DataTextField determines what string is displayed in the control, and the DataValueField determines what well-conceived and well-written book has extensive knowledge and priceless experience overflowing "This value is associated with that field This is a convenient mechanism for retaining primary-key information for It captures without resorting ASPNET and walks the reader to a 7-4 level a sample from its pages table valuesthe true essence ofto additional data structures Figure highshowsof technical and instance of this page Fred Maples, Director of Software Engineering, NASDAQcom architectural skill"-J running
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Essential ASPNET with Examples in 7-4is the C# programmer's definitive reference for ASPNET through Figure C# DataReaderBindaspx Page Running version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C# Among the topics explored in depth are:
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ByFritz Onion Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how It is also common to NET framework Subsequent chapters explore the host of new features the results it builds on top of thebind DataSets to controls for display Because a DataSet can represent in ASPNET, of multiple the server-side compilation model, code-behind classes, server-side controls, form validation, the includingdatabase queries, however, you need to specify which portion of the DataSet should be used for binding If you simply bind to the entire development default view of book, working examples illustrate data binding model, and custom control DataSet, the Throughout thethe first table in the DataSet is used If you want more building Web-based applications DataSet to use during binding, data-bound controls best practices for control over which table within a in C# support an additional field, DataMember, that indicates which "set" of data to bind to the control For a DataSet, this means which table to bind Among the topics explored in depth are: Alternatively, you can be explicit about it and bind to a table within a DataSet, in which case the default view of that table is used Or you can be even more explicit and use the DataView that provides a "view" into a data set and can be created with custom sorting and ASPNET filtering rules architecture Web shows Listing 7-4 forms an example of binding data from a DataSet to a pair of controls Note that the first control is bound directly to the DataSet, which implicitly binds to the default view of the DataSet The Configuration second control is bound to an explicitly created DataView, whose Filter property has been populated to show only authors with last names beginning with G and whose Sort property has been set to the au_id HTTP pipeline field of the table Diagnostics and error handling Listing 7-4 Binding to a DataView Validation
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