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Listing 15-4. Projecting Using Parameterized Construction Without Referencing Members Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); db.Log = Console.Out; var contacts = from c in db.Customers where c.City == "Buenos Aires" select new CustomerContact(c.ContactName, c.Phone); foreach (var contact in contacts) { Console.WriteLine("{0} - {1}", contact.Name, contact.Phone); } In Listing 15-4, since I am using query expression syntax, and since query expression syntax requires that the query end with a select statement, I am safe using parameterized construction in that last select statement of the query. I m safe, because nothing can come after the select statement containing the parameterized constructor call that references the named class members. Here are the results of Listing 15-4: SELECT [t0].[ContactName], [t0].[Phone] FROM [dbo].[Customers] AS [t0] WHERE [t0].[City] = @p0 -- @p0: Input String (Size = 12; Prec = 0; Scale = 0) [Buenos Aires] -- Context: SqlProvider(Sql2005) Model: AttributedMetaModel Build: 3.5.20706.1 Patricio Simpson - (1) 135-5555 Yvonne Moncada - (1) 135-5333 Sergio Guti rrez - (1) 123-5555 However, since using standard dot notation syntax does not require the query to end with a select statement, it is not safe to assume that the query will work just because the projection into a named class using parameterized construction occurs in the last projection. Listing 15-5 is an example using standard dot notation syntax with the last projection using parameterized construction, but because a subsequent part of the query references the named class members, the query throws an exception. Listing 15-5. Projecting Using Parameterized Construction Referencing Members Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); db.Log = Console.Out; var contacts = db.Customers.Where(c => c.City == "Buenos Aires"). Select(c => new CustomerContact(c.ContactName, c.Phone)). OrderBy(c => c.Name); foreach (var contact in contacts) { Console.WriteLine("{0} - {1}", contact.Name, contact.Phone); } asp.net generate qr code codebude/QRCoder: A pure C# Open Source QR Code ... - GitHub A pure C# Open Source QR Code implementation. ... QR codes are generated byusing special structured payload string, when generating the QR code . qr code generator in asp.net c# How To Generate QR Code Using ASP . NET - C# Corner 24 Nov 2018 ... This blog will demonstrate how to generate QR code using ASP . NET . Create an empty web project in the Visual Studio version of your choice. 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The query in Listing 15-5 is very similar to the query in Listing 15-4 except I am using standard dot notation syntax instead of query expression syntax, and I have tacked a call to the OrderBy operator onto the end of the query. I am using parameterized construction in the final projection, but this doesn t work because the OrderBy operator is referencing a member of the named class. Here are the results of Listing 15-5: Unhandled Exception: System.InvalidOperationException: Binding error : Member 'LINQ15.CustomerContact.Name' is not a mapped member of 'LINQ15.CustomerContact'. Because of these complexities, I recommend using object initialization instead of parameterized construction whenever possible. You can use the javap utility to look inside a class file. 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