A `using` statement is a C# and VB.NET language feature that simplifies deterministic cleanup of disposable resources. Not to be confused with the (C# only) `using` directive (related to namespaces), for which use tag `using-directives`.
It takes an expression that evaluates to an IDisposable. After that it executes an associated code block. Once the code block exits(both with normal and exceptional exits) it disposes the result of the original expression.
C# Example:
using (StreamReader sr = new StreamReader("c:\file.txt"))
{
//statements
}
VB.NET Example:
Using sr As New StreamReader("c:\file.txt")
'statements
End Using
For Details check:
