Error BC30452 Operator is not defined for types and Operator - is not defined for types in VB

Dear Sir,

I have an error `Error BC30452 Operator '/' is not defined for types 'XUnit' and 'Integer'. and Error BC30452 Operator '-' is not defined for types 'XUnit' and 'Double'. when I convert from c# to vb.net

Please Guide me

Thanks

Code in C#

if (chk_waterMask.Checked)
{
    var font = new XFont("Tahoma", 120.0f);
    var sizes = xgr.MeasureString(txt_waterMask.Text, font);
    xgr.TranslateTransform(page.Width / 2, page.Height / 2);
    xgr.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI);
    xgr.TranslateTransform(-page.Width / 2, -page.Height / 2);
    var format = new XStringFormat();
    format.Alignment = XStringAlignment.Near;
    format.LineAlignment = XLineAlignment.Near;
    XBrush brush = new XSolidBrush(XColor.FromArgb(128, 255, 0, 0));
    xgr.DrawString(txt_waterMask.Text, font, brush,
        new XPoint((page.Width - sizes.Width) / 2, (page.Height - sizes.Height) / 2),
        format);
 
}

Code in VB.NET

If chk_waterMask.Checked Then
    Dim font = New XFont("Tahoma", 120.0F)
    Dim sizes = xgr.MeasureString(txt_waterMask.Text, font)
   '`Below Error BC30452 Operator '/' is not defined for types 'XUnit' and 'Integer'
    xgr.TranslateTransform(page.Width / 2, page.Height / 2)
   '`Below Error BC30452 Operator '/' is not defined for types 'XUnit' and 'XUnit'.
    xgr.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI)
   ''Below Error BC30487 Operator '-' is not defined for type 'XUnit'.
    xgr.TranslateTransform(-page.Width / 2, -page.Height / 2)
    Dim format = New XStringFormat()
    format.Alignment = XStringAlignment.Near
    format.LineAlignment = XLineAlignment.Near
    Dim brush As XBrush = New XSolidBrush(XColor.FromArgb(128, 255, 0, 0))
   '`Below Error BC30452 Operator '-' is not defined for types 'XUnit' and 'Double'.                       
    xgr.DrawString(txt_waterMask.Text, font, brush, New XPoint((page.Width - sizes.Width) / 2, (page.Height - sizes.Height) / 2), format)
End If