Getting selectedvalue of radiobuttonlist in gridview on selectedindexchanged - asp.net

Question

There is a radiobuttonlist in a gridview. I want to do something with the selectedvalue of which radiobuttonlist's selectedindexchanged.
But it's giving the old value always. For example the first item is selected when page load. If I click the second item, its still giving the first item's value.
My codes, in aspx file:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="cezaDS" >
<Columns>
<asp:TemplateField HeaderText="Öğrenci Bilgileri" SortExpression="SINIF">
<ItemTemplate>
<asp:Label ID="lbSiraNo" Visible="false" runat="server" Text='<%# Eval("SIRA_NO") %>'></asp:Label>
<asp:Label ID="Label4" runat="server" Text='<%# Bind("ADI_SOYADI") %>'></asp:Label><br />
<asp:Label ID="Label3" runat="server" Text='<%# Bind("OKUL_NO") %>'></asp:Label><br />
<asp:Label ID="Label2" runat="server" Text='<%# Bind("BOLUM") %>'></asp:Label><br />
<asp:Label ID="Label1" runat="server" Text='<%# Bind("SINIF") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Ceza Türü ve Aldığı Zaman" SortExpression="DONEM">
<ItemTemplate>
Ceza Türü: <b><asp:Label ID="Label7" runat="server" Text='<%# Bind("CEZA_TURU") %>'></asp:Label></b><br />
Cezayı Aldığı Sınıf: <b><asp:Label ID="Label6" runat="server" Text='<%# Bind("CEZA_ALDIGI_SINIF") %>'></asp:Label></b><br />
Cezayı Aldığı Öğretim Yılı: <b><asp:Label ID="Label5" runat="server" Text='<%# Bind("DONEM") %>'></asp:Label></b>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ILGILI_MADDE" HeaderText="İlgili Madde" SortExpression="ILGILI_MADDE" />
<asp:TemplateField HeaderText="Kararınız">
<ItemTemplate>
<asp:RadioButtonList ID="rdList" runat="server"
AutoPostBack="True" OnSelectedIndexChanged="rdList_SelectedIndexChanged">
<asp:ListItem Value="Kaldırılsın">Kaldırılsın</asp:ListItem>
<asp:ListItem Value="Kaldırılmasın">Kaldırılmasın</asp:ListItem>
</asp:RadioButtonList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
In cs file:
protected void rdList_SelectedIndexChanged(object sender, EventArgs e)
{
GridViewRow row = (GridViewRow)(((RadioButtonList)sender).NamingContainer);
Label cezaSiraNo = (Label)(row.FindControl("lbSiraNo"));
RadioButtonList clickedList= (RadioButtonList)sender;
string x = clickedList.SelectedValue;
//...
Here x variable is taking the wrong value.