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How to check that RadioButtonList has a selected value

RadioButtonList has two property to find out any item is selected or not.

1) SelectedIndex

2) SelectedItem

HTML

<asp:RadioButtonList ID="RadioButtonList1" runat="server">
<asp:ListItem Value="0" Selected="True">YES</asp:ListItem>
<asp:ListItem Value="1">NO</asp:ListItem>
</asp:RadioButtonList>

Sometime you need to check to see if a value has been selected before you do anything in coding

CS Code

if (RadioButtonList1.SelectedItem != null)
{
     RadioButtonList1.SelectedItem.Selected = false;
}

Or 

if(RadioButtonList1.SelectedIndex<>-1)
{
     RadioButtonList1.SelectedItem.Selected=false;
}

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