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Passing a JavaScript variable in SQL Datasource in ASP.Net C#
var div = document.getElementById('main_content').offsetHeight;
            var length = Mah.round(div / 400);

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:qbuyConnectionString1 %>"
         SelectCommand="SELECT TOP variable * FROM [advertisement] WHERE ([enable] = @enable) ORDER BY NEWID()">
        <SelectParameters><asp:Parameter DefaultValue="1" Name="enable" Type="Int32" /></SelectParameters>
</asp:SqlDataSource>

$.get('query.asp', {length: length});

<input type="hidden" id="dataForSQL"></input>

$('#dataForSQL').html(length);