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If you look at the following code, you ll see that when you supply the type name at the beginning of the declaration, you are supplying information that the compiler should already be able to infer from the right side of the initialization. In the first variable declaration, the compiler can infer that 15 is an int. In the second declaration, the object-creation expression on the right side returns an object of type MyExcellentClass. So in both cases, including the explicit type name at the beginning of the declaration is redundant. static void Main( ) { int total = 15; MyExcellentClass mec = new MyExcellentClass(); ... } Starting with C# 3.0 you can use the new keyword var in place of the explicit type name at the beginning of the variable declaration, as follows: static void Main( ) { Keyword var total = 15; var mec = new MyExcellentClass(); ... } The var keyword does not signal a special kind of variable. It s just syntactic shorthand for whatever type can be inferred from the initialization on the right side of the statement. In the first declaration, it is shorthand for int. In the second, it is shorthand for MyExcellentClass. The preceding code segment with the explicit type names and the code segment with the var keywords are semantically equivalent. Some important conditions on using the var keyword are the following: You can use it only with local variables not with fields. You can use it only when the variable declaration includes an initialization. Once the compiler infers the type of a variable, it is fixed and unchangeable.

Note The var keyword is not like the JavaScript var that can reference different types. It s shorthand for the actual type inferred from the right side of the equals sign. The var keyword does not change the strongly typed nature of C#.

Figure 6-2

Method bodies can have other blocks nested inside them. There can be any number of blocks, and they can be sequential or nested further. Blocks can be nested to any level. Local variables can be declared inside nested blocks, and like all local variables, their lifetimes and visibility are limited to the block in which they re declared and the blocks nested within it.

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Figure 5-3 illustrates the lifetimes of two local variables, showing the code and the state of the stack. The arrows indicate the line that has just been executed. Variable var1 is declared in the body of the method, before the nested block. Variable var2 is declared inside the nested block. It exists from the time it s declared, until the end of the block in which it was declared. When control passes out of the nested block, its local variables are popped from the stack.

Figure 6-3

Note In C and C++ you can declare a local variable, and then within a nested block you can declare another local variable with the same name. The inner name masks the outer name while within the inner scope. In C#, however, you cannot declare another local variable with the same name within the scope of the first name regardless of the level of nesting.

A local constant is much like a local variable, except that once it is initialized, its value can t be changed. Like a local variable, a local constant must be declared inside a block. The two most important characteristics of a constant are the following: A constant must be initialized at its declaration. A constant cannot be changed after its declaration.

The advantage of an online focus group is that participants can attend from their home or of ce. UMG and msdbm managers were able to communicate directly with the moderator during the sessions. Unlike normal focus groups, online groups require no travel expenses or logistic setups such as meals or the renting of a hotel room. Turnaround time was faster than with traditional focus groups.

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