单选按钮限制集

Question

我从未这样做，甚至不确定在哪里发布。对不起。

我在一个非常古老的网站上为这组三个单选按钮添加了另一部分。我相信我把它命名为rdoSheetfedPressMats0这是正确的代码吗？

它仍然允许我选择多个。我添加的是粗体。任何帮助将不胜感激。

private bool preventMoreThanOnePressMatSelection()
{
    if (rdoSheetfedPressMats.SelectedIndex != -1 && 
        rdoWebPressMats.SelectedIndex != -1 && 
        rdoSheetfedPressMats0.SelectedIndex != -1)  
    {
        rdoSheetfedPressMats.SelectedIndex = -1;
        rdoWebPressMats.SelectedIndex = -1;
        rdoSheetfedPressMats0.SelectedIndex = -1;

        lblRawMatsSelect.Text = "You can only select one raw material type.";
        lblAdditionalValSum.Text += "<br />- You can only select one raw material type.";
        lblRawMatsSelect.ForeColor = Color.Red;
        lblRawMatsSelect.Font.Italic = lblRawMatsSelect.Font.Bold = true;
        return false;
    }
    else if (rdoSheetfedPressMats.SelectedIndex == -1 && 
        rdoWebPressMats.SelectedIndex == -1 && chkUsedInPress.Checked)
    {
        lblRawMatsSelect.Text = "Select a raw material type.";
        lblAdditionalValSum.Text += "<br />- Select a raw material type.";
        lblRawMatsSelect.ForeColor = Color.Red;
        lblRawMatsSelect.Font.Italic = lblRawMatsSelect.Font.Bold = true;
        return false;
    }
    else
    {
        lblRawMatsSelect.Text = string.Empty;
        return true;
    }
}