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The global assembly cache (GAC) is a machine-wide code cache that stores assemblies specifically designated to be shared by several applications on the computer. You should share assemblies by installing them into the global assembly cache only when you need to.Steps

Async and Await keywords used for asynchronous programming in C#.

There are times when being able to limit the pattern matching duration of Regex operations could be useful, especially when working with user supplied patterns to match data.
The MatchTimeout property defines the approximate maximum time interval for a Regex instance to execute a single matching operation before the operation times out. The regular expression engine throws a RegexMatchTimeoutException exception during its next timing check after the time-out interval has elapsed. This prevents the regular expression engine from processing input strings that require excessive backtracking. 
This property is read-only. You can set its value explicitly for an individual Regex object by calling the Regex.Regex(String, RegexOptions, TimeSpan) constructor; and you can set its value for all Regex matching operations in an application domain by calling the AppDomain.SetData method and providing a value for the 
“REGEX_DEFAULT_MATCH_TIMEOUT” property. If you do not explicitly set a timeout interval, the default value Regex.InfiniteMatchTimeout is used, and matching operations do not time out.

We can achieve this using CustomReflectionContext class. provides a way for you to add or remove custom attributes from reflection objects, or add dummy properties to those objects, without re-implementing the complete reflection model. The default CustomReflectionContext simply wraps reflection objects without making any changes, but by subclassing and overriding the relevant methods, you can add, remove, or change the attributes that apply to any reflected parameter or member, or add new properties to a eflected type.

Inside the application domain when threads get created, threads gets default culture from windows initialized from the system default locale as configured in control panel > region and language settings. But with .NET Framework 4.5 it is possible to provide default culture for an application domain using DefaultThreadCurrentCulture and CurrentUICulture properties of CultureInfo class.

By default, the StringComparer class and the string.GetHashCode method use a single hashing algorithm that produces a consistent hash code across application domains. This is equivalent to setting the enabled attribute of the element to 0. This is the hashing algorithm used in the .NET Framework 4. The StringComparer class and the String.GetHashCode method can also use a different hashing algorithm that computes hash codes on a per application domain basis. As a result, hash codes for equivalent strings will differ across application domains. This is an opt-in feature; to take advantage of it, you must set the enabled attribute of the element to 1.

In the code chamber, you need to write the code, like whatever the TextBox contains is printed in the form of the bardcode on a button click. To make this application you first need to install the IDAutomationCode39.exe file. Open your code section and start writing the following code so that you can get to the solution.

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