I am working on an application that calculates a shipping price based on the amount ordered. I have a 2D array (or so I believe) that I am searching, however it only yields any results when I search for an exact number. I would like to set it so when I search a value between 1 and 10 I get a $15 for shipping. Right now I have to enter 1 to receive the $15 shipping, 11 for $10, and so on. Below is what I have so far.



Code:
Public Class frmMain

    Private strItems(,) As String = {{"1", "15"},
                                    {"11", "10"},
                                    {"51", "5"},
                                    {"101", "0"}}



    Private Sub btnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
        Me.Close()
    End Sub

    Private Sub txtordered_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txtOrdered.KeyPress
        ' allows the text box to accept numbers and the Backspace key

        If (e.KeyChar < "0" OrElse e.KeyChar > "9") AndAlso e.KeyChar <> ControlChars.Back Then
            e.Handled = True
        End If
    End Sub

    Private Sub txtordered_TextChanged(sender As Object, e As EventArgs) Handles txtOrdered.TextChanged
        lblShipping.Text = String.Empty
    End Sub

    Private Sub btnDisplay_Click(sender As Object, e As EventArgs) Handles btnDisplay.Click





        Dim strSearchForId As String
        Dim intRow As Integer

        strSearchForId = txtOrdered.Text

        Do Until intRow > strItems.GetUpperBound(0) OrElse
            strSearchForId = strItems(intRow, 0)
            intRow += 1
        Loop
        If intRow <= strItems.GetUpperBound(0) Then
            Dim intPrice As Integer
            Integer.TryParse(strItems(intRow, 1), intPrice)
            lblShipping.Text = intPrice.ToString("C0")

        End If


    End Sub

End Class
I have tried playing with the columns and rows to no avail. Some assistance would be greatly appreciated.
I am using a textbox to enter in my search value and a label to display the shipping cost.