C# - How To Select An Element By Class Instead Of ID

May 4, 2010

I have a few scattered <p> elements on the aspx page which I am grouping together using a class like so - <p class="instructions" runat="server">

In my code behind, using C# I want to hide these elements, using something like
instructions.Visible = false;

However I realize I can only do this in codebehind if I use ID but this will result in invalid HTML/CSS Selector since you can't have multiple ID's with the same ID name...

Alternatively is there another way to group the controls if not by class?

EDIT: I can't use JavaScript, so the selection must be done in C# codebehind/ASP.NET

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