如何在自动回发事件中使用单选按钮列表中的selectedValue？

Question

html File:

<p>Delivery Type :</p>
  <asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged">
  <asp:ListItem Value="0">Electronic</asp:ListItem>
  <asp:ListItem Value="1">Paper Mail</asp:ListItem>
</asp:RadioButtonList>

Code-behind page:

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
    if(RadioButtonList1.SelectedItem.Value = )
    {

    }
}

I want to use radiobutton so that if user selects the electronic mail option, the Email field should be displayed. So as per my knowledge I am trying if radiobuttonlist selected value is 0 then email field should be displayed. But I am getting an error in the if condition itself:

cannot convert type string to bool

Answer 1

When using several Radiobuttons (instead of Radio Button List) and manually setting them to the same group:

     <asp:RadioButton ID="RadioButton1" runat="server" GroupName="RadioButtonList" />
    <br />
    <asp:RadioButton ID="RadioButton2" runat="server" GroupName="RadioButtonList" />

The following should work,

if(RadioButton1.Checked)
{

}

This way there should be no datatype conversions necessary, avoiding the errors you seem to be getting. Hope this works.

Answer 2

try

if(RadioButtonList1.SelectedItem.Value == "0"){
}