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Code Analyzer for VB.NET

There is a newer version: 10.5.0.109200

Why is this an issue?
There are several compilations options available for Visual Basic source code and Option Explicit defines compiler behavior for
implicit variable declarations. Specifying Option Explicit Off will allow creating a variable by it’s first usage. This behavior can lead
to unexpected runtime errors due to typos in variable names.
Option Explicit can be set in project properties or overridden in individual source files.
Noncompliant code example
Option Explicit Off ' Noncompliant

Module MainMod

    Public Sub DoSomething(First As String, Second As String)
        Parameter = Fist        ' New local variable "Fist" is created and assigned to new local variable "Parameter" instead of "First" argument.
        DoSomething(Parameter)
        Parametr = Second       ' "Second" argument is assigned to newly created variable "Parametr" instead of intended "Parameter".
        DoSomething(Parameter)  ' Value of "Parameter" is always Nothing
    End Sub

    Private Sub DoSomething(Parameter As String)
        ' ...
    End Sub

End Module

Compliant solution
Option Explicit On

Module MainMod

    Public Sub DoSomething(First As String, Second As String)
        Dim Parameter As String = First
        DoSomething(Parameter)
        Parameter = Second
        DoSomething(Parameter)
    End Sub

    Private Sub DoSomething(Parameter As String)
        ' ...
    End Sub

End Module

Resources

   Visual Basic
  documentation - Option Explicit Statement