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C# demands that all program logic is contained within a type definition (recall from 1 that type is a term referring to a member of the set {class, interface, structure, enumeration, delegate}). Unlike in C(++), in C# it is not possible to create global functions or global points of data. In its simplest form, a C# program can be written as follows: // By convention, C# files end with a *.cs file extension. using System; class HelloClass { public static int Main(string[] args) { Console.WriteLine("Hello World!"); Console.ReadLine(); return 0; } } Here, a definition is created for a class type (HelloClass) that supports a single method named Main(). Every executable C# application must contain a class defining a Main() method, which is used to signify the entry point of the application. As you can see, this signature of Main() is adorned with the public and static keywords. Later in this chapter, you will be supplied with a formal definition of public and static. Until then, understand that public members are accessible from other types, while static members are scoped at the class level (rather than the object level) and can thus be invoked without the need to first create a new class instance.

public interface IDataRecord { int FieldCount { get; } object this[ string name ] { get; } object this[ int i ] { get; } bool GetBoolean(int i); byte GetByte(int i); char GetChar(int i); DateTime GetDateTime(int i); Decimal GetDecimal(int i); float GetFloat(int i); short GetInt16(int i); int GetInt32(int i); long GetInt64(int i); ... bool IsDBNull(int i); }

The IDataReader.IsDBNull() method can be used to programmatically discover if a specified field is set to null before obtaining a value from the data reader (to avoid triggering a runtime exception).

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At this point, you should have a better idea of the common functionality found among all .NET data providers. Recall that even though the exact names of the implementing types will differ among data providers, you are able to program against these types in a similar manner that s the beauty of interface-based polymorphism. Therefore, if you define a method that takes an IDbConnection parameter, you can pass in any ADO.NET connection object: public static void OpenConnection(IDbConnection cn) { // Open the incoming connection for the caller. cn.Open(); } The same holds true for a member return value. For example, consider the following simple C# program, which allows the caller to obtain a specific connection object using the value of a custom enumeration (assume you have used System.Data): namespace ConnectionApp { enum DataProvider { SqlServer, OleDb, Odbc, Oracle } class Program { static void Main(string[] args) { // Get a specific connection. IDbConnection myCn = GetConnection(DataProvider.SqlServer); // Assume we wish to connect to the SQL Server Pubs database. myCn.ConnectionString = "Data Source=localhost;uid=sa;pwd=;Initial Catalog=Pubs";

A partial attribute value within an element (for example, as a part of a URL) A particular attribute name and value combination (or part thereof) in an element In this section we will go into greater detail about these possibilities.

// Now open connection via our helper function. OpenConnection(myCn); // Use connection and close when finished. ... myCn.Close(); } static IDbConnection GetConnection(DataProvider dp) { IDbConnection conn = null; switch (dp) { case DataProvider.SqlServer: conn = new SqlConnection(); break; case DataProvider.OleDb: conn = new OleDbConnection(); break; case DataProvider.Odbc: conn = new OdbcConnection(); break; case DataProvider.Oracle: conn = new OracleConnection(); break; } return conn; } } } The benefit of working with the general interfaces of System.Data is that you have a much better chance of building a flexible code base that can evolve over time. For example, perhaps today you are building an application targeting Microsoft SQL Server, but what if your company switches to Oracle months down the road If you hard-code the types of System.Data.SqlClient, you will obviously need to edit, recompile, and redeploy the assembly.

Summary

To further increase the flexibility of your ADO.NET applications, you could incorporate a client-side *.config file that makes use of custom key/value pairs within the <appSettings> element. Recall from 11 that custom data can be programmatically obtained using types within the System.Configuration namespace. For example, assume you have specified the connection string and data provider values within a configuration file as so: <configuration> <appSettings> <add key="provider" value="SqlServer" /> <add key="cnStr" value= "Data Source=localhost;uid=sa;pwd=;Initial Catalog=Pubs"/> </appSettings> </configuration>

With this, you could update Main() to programmatically read these values. By doing so, you essentially build a data provider factory. Here are the relevant updates: static void Main(string[] args) { // Read the provider key. string dpStr = ConfigurationManager.AppSettings["provider"]; DataProvider dp = (DataProvider)Enum.Parse(typeof(DataProvider), dpStr); // Read the cnStr. string cnStr = ConfigurationManager.AppSettings["cnStr"]; // Get a specific connection. IDbConnection myCn = GetConnection(dp); myCn.ConnectionString = cnStr; ... }

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