How to display ppt on aspx page

I tried like below. How can I make it display in the page itself rather than opening with File Download Open/Save.
aspx:
<tr> <td>     <asp:Button ID="Button1" runat="server" Text="Play PPTX" OnClick="Button1_Click" /> </td> </tr>

C#,
protected void Button1_Click(object sender, EventArgs e)     {         Response.Write("<script>window.open('docs/Introduction.pptx');</script>");     }