First of all, I tried your HTML and see everything on white background, but in the Web browser. Perhaps your observations a wrong and what you see is the artifact of some defected mail viewer; I don't know what are you using to view it.
But your HTML code is bad and your table looks ugly. You are doing it wrong. Try to use better techniques:
- In your mail content, write complete HTML document, starting from the
<html><head></head><body> … </body></html>
structure. - The above item will allow you to add CSS style sheet in the
<head> element. Do it. If you need to learn CSS, do it. - Move all your style-related formatting from table to CSS. If you need different classes for different table elements, introduce them.
- Even though your approach to composing strings using
StringBuilder is correct, avoid doing it for such ad-hoc purposes. Instead, create some template string representing whole HTML (or say, whole HTML and, separately, a single row line) and insert actual data using string.Format. In other words, abstract out table data from table markup. The concrete solution depends on what do you want to achieve, what is your data schema and data abstraction.
—SA
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