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A logo is a graphic or text or a combination of the two that identi es a company or organization or its products or services in a unique way. It is used in addition to or instead of the name in printed and online materials and is part of the effort to present those materials in a consistent way that promotes brand recognition. Because your logo represents your company or organization and will probably be used in different ways, bear in mind the following when designing your logo: You want to distinguish yourself from your competitors with a tasteful, memorable design. The logo should be recognizable at a glance, which rules out most photographs or complex graphics. The logo should be exible enough to work in several sizes (such as tiny on a business card and large on the side of a delivery van). It should work in black and white or in color. Limit the number of colors, and avoid gradients that might be hard to render in processes such as silk-screening. It should work on hard surfaces (such as building signs) or soft surfaces (such as T-shirts). Unless your company or organization is associated with a speci c culture or religion, your logo should avoid images or fonts that imply such connections. If you don't have graphic skills or access to a graphics program in which to create a logo, you can design one by using a base layout from the Design Gallery and then adding elements such as shapes, WordArt, and regular text. You can also nd logodesign services and do-it-yourself logo design programs online.

As you know, if you pass a ByVal object to a Visual Basic .NET routine that modifies the object s fields, you see the new fields values when the call returns. Conversely, the PInvoke marshaler doesn t copy data back to the object when you pass a reference type to an external DLL, to achieve better performance. In other words, by default, ref erence types are passed as input-only arguments. You can change this behavior by flagging the argument with explicit In and Out attributes, as follows:

In is a reserved word, so you can t omit the Attribute portion. Declare Sub TestRoutine Lib mydll (<InAttribute, Out> objref As Object)

The StringBuilder class is an exception to this rule because the PInvoke marshaler cop ies it back even if you pass it by value and without the Out attribute You can omit the In attribute when passing a ByRef argument that doesn t have to be initialized; in some circumstances, this omission can save a few CPU cycles when passing the object to a COM object in another apartment In its quest for greater efficiency, under certain circumstances the marshaler can decide to pin the passed argument, a detail that makes things a bit more complicated When an argument is pinned, the marshaler passes the address of the original value in the managed heap rather than the address of a copy (The word pinning is used because the object is pinned in memory and doesn t move even if a garbage collection occurs in the meantime.

) Data can be pinned in both PInvoke calls and intra-apartment COM Interop calls For example, under PInvoke, a NET string passed by value to a Unicode string argu ment is pinned: the callee receives the address of the internal character buffer, and no copy occurs If the callee doesn t abide by the by-value semantics and mistakenly changes the passed string, the managed heap might be corrupted (This happens, for example, if a longer string is assigned) Pinning occurs also when you pass a blittable formatted class because the marshaler can improve performance by passing a pointer to the NET object s memory in the managed heap Pinning happens regardless of whether you use the Out attribute (In other words, the Out attribute forces a copy of the value back to NET only if the argu ment isn t pinned.

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See Also For information about inserting elements from the Design Gallery into a publication, see Working with Pre-Designed Visual Elements in 2, Creating Visual Interest.