Guid how long

There are different types:. Do you remember the Guid. Parse method that I showed before? Well, there is a secret sibling! ParseExact converts a string into a Guid only if it has the expected format. As I said, a Guid takes 16 bytes. So it's easy to suppose that sizeof Guid will return That's because the size of a Guid is constant, but the memory allocated by the CLR isn't necessary constant because for some architecture it can add a padding at the end, at the beginning or within the allocated memory.

So, you can see the value in 2 ways: using the unsafe operator. SizeOf method from System. I'd like to add that a Guid is a bit unsigned integer. You can also store it as a byte array byte[16]. Show 5 more comments. You will need two more in length if you want to store the braces.

Note: 36 is the string length with the dashes in between. They are actually byte numbers. Shimmy Weitzhandler Eric Eric I'm pretty sure you had it right the first time, Eric. ToString returns a string of length 36, with no braces. Thanks for you two, what I will need is 36, I said I wanna store Guid. This is wrong for. NET; you only get 36 characters! You do get the braces 38 characters for the C visualizer, but not in code!

Peter Mortensen 29k 21 21 gold badges 97 97 silver badges bronze badges. Marc Gravell Marc Gravell k gold badges silver badges bronze badges. Ross Light Ross Light 3, 22 22 silver badges 35 35 bronze badges. In theory, yes. But with the huge hard disks of today, it's much more practical to use something like varchar Converts the specified read-only span of characters containing the representation of a GUID to the equivalent Guid structure.

Converts span of characters representing the GUID to the equivalent Guid structure, provided that the string is in the specified format. Indicates whether the values of two specified Guid objects are equal. Indicates whether the values of two specified Guid objects are not equal. Returns a string representation of the value of this instance, according to the provided format specifier and culture-specific format information.

Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Represents a globally unique identifier GUID.

SerializableAttribute ComVisibleAttribute. Is this page helpful? Finally, if you want to be notified of changes on a query you have to submit the query. You are constructing the SqlCommand object, set up the notification and then Unless you actually submit the query, you did not yet subscribed to anything.

One more thing: don't invoke UI code in background callbacks. You cannot call MessageBox. Show "Message Received" ; from a callback, you must route through the form main thread via Form. YEs, I know that strictly speaking MessageBox. Show does work on a non-UI thread but you will soon move away from alert boxes to actually form interaction and then things will break.

Asked 3 Months ago Answers: 5 Viewed 18 times. Both have pros and cons, it depends entirely on how you use them that matters. I Quote here here since it's an old article that may be gone forever in a few years In general, equality comparisons make a lot of sense with uniqueidentifier values.

Dave B. I'm hoping that its a stupid mistake I've made. Unfortunately or fortunately? Suggestions for fix: Make Start and Stop statics, call Start in application start up.