How to Add Class and Styles to HTML Table in Code Behind without 'System.Web.UI.HtmlControls.HtmlGenericControl' cannot be converted to 'System.Web.UI.HtmlControls.HtmlTableRow'.

I want to programmatically add the class and/or styles to an html table in asp.net.
I'm getting this error. I'm using Visual Studio 2015.

When I build, I get this error and the code behind doesn't recognize the element:
 'System.Web.UI.HtmlControls.HtmlGenericControl' cannot be converted to 'System.Web.UI.HtmlControls.HtmlTableRow'.

<table id="TableAvailableRepeater"  runat="server" class="display scrollTable" style="width: 100%; text-align: left !important; white-space: nowrap; overflow: auto;">
 <tbody id="dataContainerAvailable" clientidmode="Static" runat="server">
                                    <asp:Repeater ID="repAvailableRepeater" runat="server">
                                        <ItemTemplate>
                                            <%# Eval("dcBuildRow").ToString()%>
                                        </ItemTemplate>
                                    </asp:Repeater>
                                </tbody>
                            </table>

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I read there were problems with VS2012 that caused this problem when there is a tbody or thead, but this is VS2015 and I removed the tbody and the error still occurrec.

This is the type of codebehind I'm hoping to use.

            Dim addClass = "display scrollTable"
            TableAvailableRepeater.Attributes.Add("class", addClass)
            TableAvailableRepeater.Attributes.Add("style", "width: 100%; text-align: left !important; white-space: nowrap; overflow: auto;")

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Any ideas how to get this to work without the error?

Thanks!