Determine Selected Radiobutton in Constructor in C# [duplicate]

This question already has answers here: How to get the selected value from RadioButton开发者_StackOverflow中文版List? (5 answers) Closed 10 years ago.

Hello,

I have this constructor:

public EmployeeCategorizationControl()
        {


        }

and many radio buttons:

<asp:RadioButtonList ID="selectedYesNoQuestionBlock1" runat="server" RepeatDirection="Horizontal"
                OnSelectedIndexChanged="Question1GotAnswered" AutoPostBack="true">
                <asp:ListItem Text="Yes" Value="1"></asp:ListItem>
                <asp:ListItem Text="No" Value="0"></asp:ListItem>
            </asp:RadioButtonList>

<asp:RadioButtonList ID="selectedYesNoQuestionBlock2" runat="server" RepeatDirection="Horizontal"
                AutoPostBack="true" OnSelectedIndexChanged="Question2GotAnswered">
                <asp:ListItem Text="Yes" Value="1"></asp:ListItem>
                <asp:ListItem Text="No" Value="0"></asp:ListItem>
            </asp:RadioButtonList>

In my constructor, how can I determine which radio button is selected?

Thanks in advance!

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With asp.net, interacting with controls in the constructor is not a good idea because of the way the page life cycle works. You might want to glance through the page life cycle msdn page and consider Load or Init event instead.

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You can't: the Request isn't available until the after constructing the page instance. You have to do it at a later point in the page lifecycle.

Before Load (during initialization for example) you can only access the selection through the request:

protected sub Page_Init(object sender, EventArgs args) {
    var selection = Request.Form["selectedYesNoQuestionBlock1"];
}

Load maps the request values to your control objects - from that point on you can access the values directly through the controls:

protected sub Page_Load(object sender, EventArgs args) {
    var selection = selectedYesNoQuestionBlock1.SelectedValue;
}