OnCheckedChanged of my radio button does not work

Hi, i dont know why when i click on the radio button in design mode , its OnCheckedChanged does not appear in behind code, and when i write OnCheckedChanged="rdbtnGozineh_CheckedChanged  my self, it does not work, i mean when i run my project and when i change the radio button , protected void rdbtnGozineh_CheckedChanged does not chane , only  grdOptionsforvisitors_SelectedIndexChanged works. here is my code , woul you please help me?

<asp:GridView ID="grdOptionsforvisitors" runat="server" GridLines="None" AutoGenerateColumns="true" ShowHeader="False" DataKeyNames="Option_ID" OnSelectedIndexChanged="grdOptionsforvisitors_SelectedIndexChanged1" > < ...