VB 2010 'variable' is not declared. It may be inaccessible due to it's protection level
Solution 1
Variables in VB.NET have a very particular scope, limiting their availability to various portions of your code depending on how and where they are declared.
Your Sentence
variable has procedure-level scope, which means that it is available only within the procedure in which it was declared. In your case, it's declared in the ABCs_Load
method ("Sub"), so it will only be available to code within that method.
If, instead, you want to be able to access the Sentence
variable in any of the methods in your class (Forms
are always classes in VB.NET), you can declare the variable with Module-level scope. To do this, you need to add a private field to your Sentences
class, outside of any particular method (Sub or Function). This declaration will look something like this:
Private Sentence As String
Of course, you can also declare the variable as Public
instead of Private
, which will make it available to other classes outside of the current class. For example, if you had a second form that you wanted to be able to access the contents of your Sentence
variable, you could declare it as Public
in the first form's class and then access it from one of the methods in the second form's class like so:
MessageBox.Show(myForm1.Sentence)
Notice that because it does lie within another form (a class different than the one it is being accessed in), you have to fully qualify the reference to it. It's like how your family might call you "Mike," but others have to call you "Mike Jones" to differentiate you from "Mike Smith."
For further reading, also see these related articles on MSDN:
Solution 2
You should put :
Private Sentence As String
under Public Class Sentences
Read this to learn more : http://msdn.microsoft.com/en-us/library/43s90322%28v=VS.80%29.aspx
benj
Updated on April 25, 2021Comments
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benj about 3 years
i'm sort of a n00b to VB and was wondering how to make a variable available across multiple Subs. It's just a test app to get familiar with VB. My Code:
Public Class Sentences Private Sub SentenceBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SentenceBox.TextChanged If Me.Text = Trim(Sentence) Then MsgBox("Good job!") Main_Menu.Show() Me.Close() End If End Sub Private Sub ABCs_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim random As Integer = CInt((Rnd() * 10) + 1) Dim Sentence As String Select Case random Case 1 Sentence = "The quick brown fox jumped over the lazy dog!" Case 2 Sentence = "Hi there, how are you doing?" Case 3 Sentence = "What is the answer to life?" Case 4 Sentence = "The cat in the hat was fat." Case 5 Sentence = "John and Sam had always been fat." Case 6 Sentence = "The snow is falling hard." Case 7 Sentence = "Here, dinner is always served nightly." Case 8 Sentence = "The dog barks at the passing cars." Case 9 Sentence = "The dust settles on the books." Case 10 Sentence = "Fire burns brightly when you add kerosene." End Select End Sub Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click SentenceBox.Text = Sentence End Sub End Class
My error is:
"Sentences" is not declared. It may be in accessable due to it's protection level."