Error BC30205 End of statement expected in VB.Net

 Dear Sir,

I'm Trying to convert from c# to vb.net.

But I have an error "Error BC30205 End of statement expected"

Please Guide me

Thanks

internal static class Extensions
{
    /// <summary>
    /// Provides access to all controls on a form.
    /// </summary>
    /// <remarks>
    /// See wrapper below <see cref="TextBoxList"/>
    /// </remarks>
    public static IEnumerable<T> Descendants<T>(this Control control) where T : class
    {
        foreach (Control child in control.Controls)
        {
            if (child is T thisControl)
            {
                yield return (T)thisControl;
            }
 
            if (child.HasChildren)
            {
                foreach (T descendant in Descendants<T>(child))
                {
                    yield return descendant;
                }
            }
        }
    }
}

after convert to vb.net

Friend Module Extensions
    ''' <summary>
    ''' Provides access to all controls on a form.
    ''' </summary>
    ''' <remarks>
    ''' See wrapper below <see cref="TextBoxList"/>
    ''' </remarks>
    <System.Runtime.CompilerServices.Extension> _
    Public Iterator Function Descendants(Of T As Class)(ByVal control As Control) As IEnumerable(Of T)
        For Each child As Control In control.Controls
            Dim tempVar As Boolean = TypeOf child Is T
            Dim thisControl As T = If(tempVar, CType(child, T), Nothing)
            If tempVar Then
                                    'error below line code "Error BC30205 End of statement expected"
                Yield (T)thisControl
            End If
 
            If child.HasChildren Then
                For Each descendant As T In Descendants(Of T)(child)
                    Yield descendant
                Next descendant
            End If
        Next child
    End Function
End Module