How do I put a Bootstrap Glyphicon inside an asp:Button in ASP.Net?

You have to use asp:LinkButton instead of a asp:Button, here is how it works for me using Bootstrap 3 in an ASP.NET web-application:

From your code you can make the following work:

<asp:LinkButton ID="btnRandom" 
            runat="server" 
            CssClass="btn btn-primary"    
            OnClick="btnRandom_Click">
    <span aria-hidden="true" class="glyphicon glyphicon-refresh"></span>
</asp:LinkButton>

Here is an example of what I use for a Submit Button with text “Submit”:

<asp:LinkButton ID="SubmitBtn" 
                runat="server" 
                CssClass="btn btn-primary"    
                OnClick="SubmitBtn_Click">
    <span aria-hidden="true" class="glyphicon glyphicon-ok"></span>Submit
</asp:LinkButton>

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