Updating a row using checkbox

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C#

ASP.NET

Hi ,
iam using an grid in which inside the item template(the first one in which radio button is there)if i use link button instead of radiobutton ,when i click on iam able to edit as the textbox apperars, but if i use the radio button,that editing option is not coming;

aspx:

<asp:GridView ID="grd" runat="server" OnRowEditing="selectrd_CheckedChanged"  AutoGenerateColumns="false" DataKeyNames="id">
             <Columns>
                 <asp:TemplateField HeaderText="edition">
                <ItemTemplate>
              <big>  <asp:RadioButton ID="rdnselect" runat="server"   CommndName="edit" /></big>

                </ItemTemplate>
                 </asp:TemplateField>
              <asp:BoundField HeaderText="ids" DataField="id" />
                 <asp:TemplateField HeaderText="password">
                     <ItemTemplate>
                         <%# Eval("pwd") %>
                     </ItemTemplate>
                     <EditItemTemplate>
                         <asp:TextBox ID="edits" runat="server" Text='<%# Eval("pwd") %>'></asp:TextBox>
                     </EditItemTemplate>
                 </asp:TemplateField>
             </Columns>




               </asp:GridView>

cs:

protected void selectrd_CheckedChanged(object sender, GridViewEditEventArgs e)

  {
      grd.SelectedIndex = e.NewEditIndex;
      ldgrid();

  }