How to set data-attributes with ASP.NET?

Question

How can data-attributes be set using code behind?

ASP.NET

<asp:Label ID="lbl" runat="server" Text="Value" />
<asp:Panel ID="pnl" runat="server" />    

VB

lbl.Text = "Text"
pnl.Attributes("data-attribute") = "200"
//Is this correct?

DESIRED MARKUP

<span id="lbl">Text</span>
<div id="pnl" data-attribute="200">Value</div>

Answer 1

pnl.Attributes("data-attribute") = "200"

Answer 2

C#:

pnl.Attributes["data-attribute"] = "200";

VB:

pnl.Attributes("data-attribute") = "200"