title: asp:Textbox with type=number allowing "e"
body: <p>I am currently making an asp.net webpage with a asp:TextBox field, I set the TextBox to type=number, and it is now accepting only numbers with one exception. It also accepts the letter "e". Does someone know what might cause this and how to solve it?</p>
  
  <pre><code>&lt;asp:TextBox CssClass="form-control" type="number" id="LotNumber" placeholder="Lotnummer" runat="server" Text="&lt;% $RouteValue:ordernummer %&gt;"/&gt;
  </code></pre>