Pulling items out of an Array

Here is one approach:

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private myArray() As String

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ' Put some test data in our array
        Dim temp As String
        temp = "cat,dog,elephant,cougar,crab,bear,fish,camel"
        myArray = Split(temp, ",")
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim match As String
        Dim matches As ArrayList = getEntries("c")

        For Each match In matches
            ' do something with each match
            Debug.WriteLine(match)
        Next
    End Sub

    Private Function getEntries(ByVal beginningWith As String) As ArrayList
        Dim entries As ArrayList = New ArrayList
        Dim i As Integer

        For i = 0 To myArray.GetUpperBound(0)
            If myArray(i).StartsWith(beginningWith) Then
                entries.Add(myArray(i))
            End If
        Next i

        Return entries
    End Function

End Class