Why Not Accept TreeView SelectedNode based onTextBox.Text ?

[Nicomendox]

wtihs this code I set Focus to TreeView Node.

 Private Sub Button12_Click(sender As Object, e As EventArgs) Handles Button12.Click
        
        'Expand(TextBox3.Text) '("C:\7143\Baltek")
        gotNode = False
        For Each n As TreeNode In Me.TreeView1.Nodes
            If Not gotNode Then
                
                selectTreeNode(n, TextBox3.Text) ' "C:\7143\Baltek")

                
            End If
          
        Next

    End Sub

When I try to set focus TreeViewNode based on TextBox.Text (with dont care uppercase, lowercase) then no result.

For Excample Node Tag is "C:\7143\Baltek")

if I enter "C:\7143\baltek") or "C:\7143\BalteK") no result, because of Upper LowerCase typing

how can I adjust to find not with any type textbox.text.