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string[] stringArray = {"one", "two", "three"}; foreach (string element in stringArray) { // This code loops three times, with the element variable set to // "one", then "two", and then "three". System.Diagnostics.Debug.Write(element + " "); } In this case, the foreach loop examines each item in the array and tries to convert it to a string. Thus, the foreach loop defines a string variable named element. If you used a different data type, you d receive an error. The foreach loop has one key limitation: it s read-only. For example, if you wanted to loop through an array and change the values in that array at the same time, foreach code wouldn t work. Here s an example of some flawed code: int[] intArray = {1,2,3}; foreach (int num in intArray) { num += 1; } In this case, you would need to fall back on a basic for loop with a counter.

Tip Sometimes you need to skip to the next iteration of a loop in a hurry. In VB, you can use the Continue

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Finally, C# supports a while loop that tests a specific condition before or after each pass through the loop. When this condition evaluates to false, the loop is exited. Here s an example that loops ten times. At the beginning of each pass, the code evaluates whether the counter (i) is less than some upper limit (in this case, 10). If it is, the loop performs another iteration. int i = 0; while (i < 10) { i += 1; // This code executes ten times. } You can also place the condition at the end of the loop using the do while syntax. In this case, the condition is tested at the end of each pass through the loop: int i = 0; do { i += 1; // This code executes ten times. } while (i < 10); Both of these examples are equivalent, unless the condition you re testing is false to start. In that case, the while loop will skip the code entirely. The do while loop, on the other hand, will always execute the code at least once, because it doesn t test the condition until the end.

Note URIs in WSDL files are case-sensitive. http://localhost/demo is not the same as http://

Do statement to skip the rest of the current pass, evaluate the condition, and (if it returns True) start the next pass. You can perform the same feat with a For block using the Continue For statement. Finally, you can use the Exit Do and Exit For statements to jump straight out of a loop.

Tip Sometimes you need to exit a loop in a hurry. In C#, you can use the break statement to exit any type of

Methods are the most basic building block you can use to organize your code. Essentially, a method is a named grouping of one or more lines of code. Ideally, each method will perform a distinct, logical task. By breaking your code down into methods, you not only simplify your life, but you also make it easier to organize your code into classes and step into the world of objectoriented programming.

loop. You can also use the continue statement to skip the rest of the current pass, evaluate the condition, and (if it returns true) start the next pass.

Note In pre-.NET versions of Visual Basic (such as VB 6), functions and subroutines are usually described

Methods are the most basic building block you can use to organize your code Essentially, a method is a named grouping of one or more lines of code Ideally, each method will perform a distinct, logical task By breaking your code down into methods, you not only simplify your life, but you also make it easier to organize your code into classes and step into the world of object-oriented programming The first decision you need to make when declaring a method is whether you want to return any information For example, a method named GetStartTime() might return a DateTime object that represents the time an application was first started A method can return, at most, one piece of data When you declare a method in C#, the first part of the declaration specifies the data type of the return value, and the second part indicates the method name.

Listing 19-1. A Sample WDSL File (demo.wsdl) < xml version ="1.0" encoding ="UTF-8" > <definitions name="demo" targetNamespace="http://localhost/demo" xmlns:tns="http://localhost/demo" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.xmlsoap.org/wsdl/"> <message name="DemoRequest"> <part name="param1" type="xsd:string" /> </message> <message name="DemoResponse"> <part name="Result" type="xsd:string" /> </message> <portType name="DemoPortType"> <operation name="Demo"> <input message="tns:DemoRequest" /> <output message="tns:DemoResponse" /> </operation> </portType> <binding name="DemoBinding" type="tns:DemoPortType"> <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http" /> <operation name="Demo">

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