Error with radiobuttons on ASP.NET
<p>Why does the below code show me an error? Please correct this:</p>

<pre><code>    protected void Button1_Click(object sender, EventArgs e)
{
    if (RadioButtonList1.SelectedIndex='0') 
    {
        Response.Redirect("page1.aspx");
    }
    else if (RadioButtonList1.SelectedIndex='1') 
    {
        Response.Redirect("page2.aspx");
    }
    else if (RadioButtonList1.SelectedIndex='2') 
    {
        Response.Redirect("page3.aspx");
    }
}
</code></pre>

<p>My design code is:</p>

<pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml" &gt;
&lt;head runat="server"&gt;
    &lt;title&gt;Untitled Page&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;form id="form1" runat="server"&gt;
    &lt;div&gt;
        &lt;asp:RadioButtonList ID="RadioButtonList1" runat="server"&gt;
            &lt;asp:ListItem&gt;item1&lt;/asp:ListItem&gt;
            &lt;asp:ListItem&gt;item2&lt;/asp:ListItem&gt;
            &lt;asp:ListItem&gt;item3&lt;/asp:ListItem&gt;
        &lt;/asp:RadioButtonList&gt;&lt;/div&gt;
        &lt;asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /&gt;
    &lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
