I want to make search box like "if the left box match with the list, then it'll show to right box", is there something wrong with my code? thx

public ke As Integer
    Dim kelA(ke) As Object
    Dim kelB(ke) As Object

    Public Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        kelA(0) = a1.text : kelB(0) = b1.text
        kelA(1) = a2.text : kelB(1) = b2.text
        kelA(2) = a3.text : kelB(2) = b3.text
        kelA(3) = a4.text : kelB(3) = b4.text
end sub
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
        For i = 0 To 1
            If kelA(ke) = a.Text Then
                b.Text = kelB(ke)
            Else
                ke = i + 1
            End If
        Next
    End Sub