ASP.net page without a code behind
By default Sharepoint does not allow server-side code to be executed in ASPX files. See this for how to resolve that.
However, I would raise that having a code-behind is not necessarily difficult to deploy in Sharepoint (we do it extensively) - just compile your code-behind classes into an assembly and deploy it using a solution.
If still no, you can include all the code you'd normally place in a codebehind like so:
<script language="c#" runat="server">public void Page_Load(object sender, EventArgs e){ //hello, world!}</script>
You can actually have all the code in the aspx page. As explained here.
Sample from here:
<%@ Language=C# %><HTML> <script runat="server" language="C#"> void MyButton_OnClick(Object sender, EventArgs e) { MyLabel.Text = MyTextbox.Text.ToString(); } </script> <body> <form id="MyForm" runat="server"> <asp:textbox id="MyTextbox" text="Hello World" runat="server"></asp:textbox> <asp:button id="MyButton" text="Echo Input" OnClick="MyButton_OnClick" runat="server"></asp:button> <asp:label id="MyLabel" runat="server"></asp:label> </form> </body></HTML>
yes on your aspx page include a script tag with runat=server
<script language="c#" runat="server">public void Page_Load(object sender, EventArgs e){ // some load code}</script>You can also use classic ASP Syntax
<% if (this.MyTextBox.Visible) { %><span>Only show when myTextBox is visible</span><% } %>