Radio button does not return selected value

[momax]

i am using radio button list control in asp.net. i m trying to get selected value on button click Eventbut,i m getting \[code\]Empty string\[/code\] and i want it without javascript.How can i do this?\[code\] <asp:RadioButtonList ID="RadioButtonList1" EnableViewState="true" runat="server" Width="287px"> <asp:ListItem Value="http://stackoverflow.com/questions/12621785/Single" runat="server" Text="Single"></asp:ListItem> <asp:ListItem Value="http://stackoverflow.com/questions/12621785/Jointly" runat="server" Text="Married Filing Jointly/Widower"></asp:ListItem> <asp:ListItem Value="http://stackoverflow.com/questions/12621785/Separately" runat="server" Text="Married Filing Separately"></asp:ListItem> <asp:ListItem Value="http://stackoverflow.com/questions/12621785/Household" runat="server" Text="Head Of Household "></asp:ListItem> </asp:RadioButtonList>please help me.\[/code\]Thanks.. C# code \[code\]protected void btnCalculate_Click(object sender, EventArgs e) { string selectedValue = http://stackoverflow.com/questions/12621785/RadioButtonList1.SelectedValue; }\[/code\]