winforms qr code

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command object, but you ll keep the reference stored using a database-neutral object: DbCommand. Here s the line of code that does the job: // Create a database specific command object DbCommand comm = conn.CreateCommand(); Now that you have a connection object and a command object, you can play with them just like the good old days. Here s a fairly complete (and almost working) ADO.NET code listing that loads the list of departments into a DataTable without knowing what kind of database it s working with: // Create a new database provider factory DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.SqlClient"); // Create the connection object DbConnection conn = factory.CreateConnection(); // Initialize the connection string conn.ConnectionString = "... connection string ..."; // Create the command object and set its properties DbCommand comm = conn.CreateCommand(); comm.CommandText = "CatalogGetDepartments"; comm.CommandType = CommandType.StoredProcedure; // Open the connection conn.Open(); // Execute the command and save the results in a DataTable DbDataReader reader = comm.ExecuteReader(); DataTable table = new DataTable(); table.Load(reader); // Close the reader and the connection reader.Close(); conn.Close();

changed. Take a look at the methods associated with string, and you will see nothing that allows you to modify the contents. An immutable type is good because it allows you to implement a set-it-and-forget-it object, and it prevents other classes from accidentally changing the contents. Overall, an immutable type is robust and predictable.

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Although ideally our code will run without any unpleasant surprises, there s always a possibility that something might go wrong when processing client requests. In the context of a live web application, errors can happen unexpectedly for various reasons, such as software failures (operating system or database server crashes, viruses, and so on), hardware failures, or even bad or unexpected input user data. The best strategy to deal with these unexpected problems is to implement error-handling mechanisms that intercept the errors and handle them appropriately. And here we ll meet exceptions. Exceptions represent the modern way of intercepting and handling runtime errors in object-oriented languages such as C#. When a runtime error occurs in your code, the execution is interrupted, and an exception is generated (or raised). If the exception is not handled by the local code that generated it, the exception goes up through the methods in the stack trace. If it isn t handled anywhere, it s finally caught by the .NET Framework, which generates an error message. If the error happens in an ASP.NET page during a client request, ASP.NET displays an error page, eventually including debugging information, to the visitor. (The good

The following is the constructor code. public class ActiveCurrencyTrader : CurrencyTrader { string _fromCurrency; string _toCurrency; public ActiveCurrencyTrader(double currExchange, string fromCurrency, string toCurrency) { ExchangeRate = currExchange; _fromCurrency = fromCurrency; _toCurrency = toCurrency; } } The constructor has three parameters: currExchange represents the current exchange rate, fromCurrency indicates the source currency (for example, USD), and toCurrency indicates the destination currency (for example, EUR). These three parameters are assigned to data members, whereby only the current exchange rate is assigned to the base class CurrencyTrader. ExchangeRate.

The third worksheet, labeled Shipping Routes and partially shown in Figure 4-36, is a model that describes shipping goods from production plants to warehouses. You can use Solver to minimize the associated shipping costs, while also not exceeding the supply available from each plant to meet the demand from each warehouse.

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