If the thread culture already has an en-US value, you do not need to specify it.
<%= Math.Round(netValue).ToString("C") %>
Otherwise, to get a culture for the United States, first create a culture object.
CultureInfo usaCulture = new CultureInfo("en-US");
You can then pass this to the ToString method for the decimal object.
<%= Math.Round(netValue).ToString("C", usaCulture) %>
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