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copied!<p>It's a way of having fields that are local to a method. Basically, the value is maintained between calls but not accessible in other parts of the class. See <a href="http://weblogs.asp.net/psteele/pages/7717.aspx" rel="nofollow noreferrer">Static Local Variables in VB.NET</a> for some implementation information.</p> <p>EDIT: Jonathan, you're right that the fields don't have to be Shared/static. If the function/sub is declared Shared, it will be a Shared/static field. Otherwise, it will be a instance field. Either way, it is persistent across calls and local to the method. The below example (to continue <a href="https://stackoverflow.com/questions/2282615/ruby-equivalent-of-cs-yield-keyword-or-creating-sequences-without-prealloca/2282658#2282658">a theme</a>) shows both behaviors clearly:</p> <pre><code>Class Fibonacci Public Function FibonacciInstance() as Integer Static i as Integer = -1 Static j as Integer = 1 Dim k as Integer k = i + j i = j j = k return k End Function Public Shared Function FibonacciShared() as Integer Static i as Integer = -1 Static j as Integer = 1 Dim k as Integer k = i + j i = j j = k return k End Function Shared Sub Main() Dim d as Integer Dim a = New Fibonacci Dim b = New Fibonacci For d = 0 to 10 System.Console.WriteLine("a.FibonacciInstance: " & a.FibonacciInstance()) System.Console.WriteLine("b.FibonacciInstance: " & b.FibonacciInstance()) System.Console.WriteLine("a.FibonacciShared: " & a.FibonacciShared()) System.Console.WriteLine("b.FibonacciShared: " & b.FibonacciShared()) Next d End Sub End Class </code></pre>

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