I am receiving the following warning:

Warning 1 Variable 'myStreamReader' is used before it has been assigned a value. A null reference exception could result at runtime.
Here's my code:

Code:
Public Sub loadData()
        'this reads the textfile and loads the checkbox
        Dim currentFields() As String
        ' The StreamReader must be defined outside of the Try-Catch block
        '   in order to reference it in the Finally block.

        Dim myStreamReader As StreamReader
        Dim myInputString As String
        Dim rowCount As Integer = 0

        ' Ensure that the creation of the new StreamReader is wrapped in a 
        '   Try-Catch block, since an invalid filename could have been used.
        Try
            ' Create a StreamReader using a Shared (static) File class.
            myStreamReader = File.OpenText(filePath)
            ' Begin by reading a single line
            myInputString = myStreamReader.ReadLine()
            ' Continue reading while there are still lines to be read
            While Not myInputString Is Nothing
                currentFields = Split(myInputString, ",")
                If currentFields(1) = "0" Then
                    lstApts.Items.Add(currentFields(0))
                Else
                    lstApts.Items.Add(currentFields(0), True)
                End If
                rowCount += 1
                ' Read the next line.
                myInputString = myStreamReader.ReadLine()
            End While
        Catch exc As Exception
            ' Show the error to the user.
            MsgBox("File could not be opened or read." + vbCrLf + _
                "Please verify that the filename is correct, " + _
                "and that you have read permissions for the desired " + _
                "directory." + vbCrLf + vbCrLf + "Exception: " + exc.Message)
        Finally
            ' Close the object if it has been created.
            If Not myStreamReader Is Nothing Then
                myStreamReader.Close()
            End If
        End Try
    End Sub
Warning caused on If statement of Finally block.