当 Checked="true" 时未选择 asp RadioButton

Question

I have two radio buttons "Yes" and "No" and I want the "No" radio button to be selected by default. However, I can't get it be be selected through the asp code or by the code behind. Am I doing this completely wrong or did I just miss something.

ASP code:

<div class="query_header" runat="server" id="ScanOnStartup">
    <div class="formlabel" style="width: 300px">Perform Scan on startup</div>
    <div class="formfield" style="line-height: 10px">
        <asp:RadioButton ID="scanOnStartupYes" Text="Yes" GroupName="ScanOnStartupRadio" runat="server" AutoPostBack="false"  Checked="false"/>&nbsp
        <asp:RadioButton ID="sanOnStartupNo" Text="No" GroupName="ScanOnStartupRadio" runat="server" AutoPostBack="false"  Checked="true"/>
    </div>
    <div class="formdivider"></div>
</div>

Code behind:

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {               
                this.scanOnStartupNo.Checked = true;

        }

Answer 1

If you need to make a radio button checked by default on page load , you can do one of the above

From the front end , you can add the property

Checked="checked"

From the code behind, you can write it as

scanOnStartupNo.Checked=true

When I checked your code , You have made a spelling mistake in declaring the ID of NO button. That was why the code behind code piece was not working

Answer 2

从第一个 RadioButton 中删除 Checked="False"（是）

Answer 3

Okay aside from the typo "sanOnStartupNo", I know where the problem is coming from. There was actually another control from my code behind that renders the page and that is where the selection for the radio button is being set. I added in code for my radio button and it works now.