Get Check Status Of A CheckedListBox Item Using Text Instead Of Index

There was a question raised on visual basic forums if you can access an item through it's name rather than index to get it's checked status. My suggestion was to implement a custom control. However, one of the resident MVP in that forum has a better solution using extension method which is simple yet elegant. Below are the extension methods in VB.NET and C#.
VB.NET

Module CheckedListBoxExtensions
 
    <Extension()>
    Function GetItemChecked(ByVal source As CheckedListBox, ByVal text As String) As Boolean
        Dim item = source.Items.Cast(Of Object)().FirstOrDefault(Function(o) source.GetItemText(o) = text)
        Dim index = source.Items.IndexOf(item)
        Return source.GetItemChecked(index)
    End Function
 
End Module

C#.NET

 public static class CheckedListBoxExtensions
    {
        public static bool GetItemChecked(this CheckedListBox source, string text)
        {
            var item = source.Items.Cast<object>().FirstOrDefault(o => source.GetItemText(o) == text);
            var index = source.Items.IndexOf(item);

            return source.GetItemChecked(index);
        }
    }

And below codes are how to use these extension methods.
VB.NET

If (clb.GetItemChecked("US")) Then
            MessageBox.Show("US is checked")
        ElseIf (clb.GetItemChecked("AU")) Then
            MessageBox.Show("AU is checked")
        ElseIf (clb.GetItemChecked("UK")) Then
            MessageBox.Show("UK is checked")
        Else
            MessageBox.Show("None Selected")
        End If

C#.NET

   if (clb.GetItemChecked("US"))
            {
                MessageBox.Show("US is checked");
            }
            else if (clb.GetItemChecked("AU"))
            {
                MessageBox.Show("AU is checked");
            }
            else if (clb.GetItemChecked("UK"))
            {
                MessageBox.Show("UK is checked");
            }
            else
            {
                MessageBox.Show("None selected");
            }