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4635258
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0
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2011-01-08T17:48:54.860
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2012-04-10T13:51:56.687
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2012-04-10T13:51:56.687
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2
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text
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in c# we having const or readonly keyword to declare a constant. const A constant member is defined at compile time and cannot be changed at runtime. Constants are declared as a field, using the const keyword and must be initialized as they are declared. For example; <pre><code>public class MyClass { public const double PI = 3.14159; } </code></pre> PI cannot be changed in the application anywhere else in the code as this will cause a compiler error. readonly A read only member is like a constant in that it represents an unchanging value. The difference is that a readonly member can be initialized at runtime, in a constructor as well being able to be initialized as they are declared. For example: <pre><code>public class MyClass { public readonly double PI = 3.14159; } </code></pre> or <pre><code>public class MyClass { public readonly double PI; public MyClass() { PI = 3.14159; } } </code></pre> Because a readonly field can be initialized either at the declaration or in a constructor, readonly fields can have different values depending on the constructor used. A readonly field can also be used for runtime constants as in the following example: <pre><code>public static readonly uint l1 = (uint)DateTime.Now.Ticks; </code></pre> Notes readonly members are not implicitly static, and therefore the static keyword can be applied to a readonly field explicitly if required. A readonly member can hold a complex object by using the new keyword at initialization. readonly members cannot hold enumerations. credit goes here: <a href="http://www.dotnetspider.com/forum/69474-what-final-c-i-need-detailed-nfo.aspx" rel="nofollow">http://www.dotnetspider.com/forum/69474-what-final-c-i-need-detailed-nfo.aspx</a>
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1. This table or related slice is empty.
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1. POHow can make a variable (not class member) "read only" in C#
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USMartin Liversage
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1. USfingerman
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