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The for loop is a basic ingredient in many programs. It allows you to repeat a block of code a set number of times, using a built-in counter. To create a for loop, you need to specify a starting value, an ending value, and the amount to increment with each pass. Here s one example: for (int i = 0; i < 10; i++) { // This code executes ten times. System.Diagnostics.Debug.Write(i); } You ll notice that the for loop starts with brackets that indicate three important pieces of information. The first portion, (int i = 0), creates the counter variable (i) and sets its initial value (0). The third portion, (i++), increments the counter variable. In this example, the counter is incremented by 1 after each pass. That means i will be equal to 0 for the first pass, equal to 1 for the second pass, and so on. However, you could adjust this statement so that it decrements the counter (or performs any other operation you want). The middle portion, (i < 10), specifies the condition that must be met for the loop to continue. This condition is tested at the start of every pass through the block. If i is greater than or equal to 10, the condition will evaluate to false, and the loop will end.

The Delete statement is even easier to use. It specifies criteria for one or more rows that you want to remove. Be careful: once you delete a row, it s gone for good! DELETE FROM [table] WHERE [search_condition] The following example removes a single matching row from the Authors table: DELETE FROM Authors WHERE au_id='172-32-1176'

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If you run this code using a tool such as Visual Studio, it will write the following numbers in the Debug window: 0 1 2 3 4 5 6 7 8 9 It often makes sense to set the counter variable based on the number of items you re processing. For example, you can use a for loop to step through the elements in an array by checking the size of the array before you begin. Here s the code you would use: string[] stringArray = {"one", "two", "three"}; for (int i = 0; i < stringArray.Length; i++) { System.Diagnostics.Debug.Write(stringArray[i] + " "); } This code produces the following output: one two three

Note If you attempt to run this specific Delete statement, you ll run into a database error. The problem is that this author record is linked to one or more records in the TitleAuthor table. The author record can t be removed unless the linked records are deleted first. (After all, it wouldn t make sense to have a book linked to an author that doesn t exist.)

If you define a variable inside some sort of block structure (such as a loop or a conditional block), the variable is automatically released when your code exits the block. That means you will no longer be able to access it. The following code demonstrates this behavior:

To get the most from the previous theory, you ll want to create a couple of simple applications. The following two examples demonstrate common GET and POST requests.

The Delete and Update commands return a single piece of information: the number of affected records. You can examine this value and use it to determine whether the operation is successful or executed as expected. The rest of this chapter shows how you can combine SQL with the ADO.NET objects to retrieve and manipulate data in your web applications.

int tempVariableA; for (int i = 0; i < 10; i++) { int tempVariableB; tempVariableA = 1; tempVariableB = 1; } // You cannot access tempVariableB here. // However, you can still access tempVariableA.

This change won t affect many programs. It s really designed to catch a few more accidental errors. If you do need to access a variable inside and outside of some type of block structure, just define the variable before the block starts.

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