How to draw multiple strings from a list with PDFSharp without them overlapping?

Question

I have a list itemDescList that contains n number of strings. In pdfCreate , the app draws a rectangle and in the same rectangle it draws a string or multiple. My problem is when I tried it like this, the strings overlap when I need them to be one under the other. I understand why this isn't working - foreach string in the list it gets drawn on the same position, however I cannot figure out how to do this. Any ideas?

rect = new XRect(35, 320, 300, 125);
gfx.DrawRectangle(XBrushes.SeaShell, rect);
tf.Alignment = XParagraphAlignment.Center;
foreach (string item in itemDescList)
{
    tf.DrawString(item + "\n", invoiceItemsFont, XBrushes.Black, rect, XStringFormats.TopLeft);
}

Answer 1

If anyone stumbles upon this question. Here's the answer:

            yBase = 320;
            yOffset = 0;
            lineHeight = 15;
            rect = new XRect(340, yBase, 30, 155);
            gfx.DrawRectangle(XBrushes.SeaShell, rect);
            tf.Alignment = XParagraphAlignment.Center;
            foreach (string item in quantityList)
            {
                XRect lineRect = new XRect(340, yBase + yOffset, 30, 125);
                tf.DrawString(item, invoiceItemsFont, XBrushes.Black, lineRect, XStringFormats.TopLeft);
                yOffset += lineHeight;
            }