(VB.net) Find specified text on an entire line (not just beginning characters) in a listbox

I hav开发者_StackOverflow社区e a listbox where each line contains a short 3-4 character model number followed by a tab and then the product name the model number corresponds to. I also have a textbox which I am using to search the listbox.

The code I am using so far works somewhat, just not exactly how I would like. If I enter search text it will highlight the results in the listbox but only for the first characters, is there anyway to search the text of an entire line (index) of a listbox?

Right now I am using the following:

Private Sub txtSearch_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtSearch.TextChanged

    ListBox.SelectedIndex = ListBox.FindString(txtSearch.Text)

End Sub

On the assumption that your line representation is the ToString() of the item in the list:

ListBox.SelectedItem.ToString().Contains(txtSearch.Text)

I got it to work by looping through and using contains. Issues with upper and lower case were giving me incorrect results so I converted the criteria to all lower.

For i = 0 To ListBox.Items.Count - 1

     If ListBox.Items(i).ToString.ToLower.Contains(Trim(LCase(txtSearch.Text))) Then
          ListBox.SelectedIndex = i
          Exit For
     End If

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