alternate background color for radios in radiobuttonlist?

I am trying to alternate background colors for items in radiobuttonlist using the below code, similar code is working on dropdownlist items

            If color Then
                        rdBtnList.Items.FindByText(lstItem.Text).Attributes.CssStyle.Add("style", "background: white;")
                        rdBtnList.Items.FindByText(lstItem.Text).Attributes.CssStyle.Add("style", "background-color: whi开发者_如何学Pythonte;")
                    Else
                        rdBtnList.Items.FindByText(lstItem.Text).Attributes.CssStyle.Add("style", "background-color: LightSlateGray;")
                        rdBtnList.Items.FindByText(lstItem.Text).Attributes.CssStyle.Add("style", "background: LightSlateGray;")
                    End If

                    color = Not color

Am I missing something?

Thanks

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that worked

 rdBtnList.Items.FindByText(lstItem.Text).Attributes.Add("style", "color: black;font-weight:bold;")