BitFlag and checkboxes

  <asp:CheckBox ID="CheckBox1" runat="server" />
        <asp:CheckBox ID="CheckBox2" runat="server" />
        <asp:CheckBox ID="CheckBox3" runat="server" />
        <asp:CheckBox ID="CheckBox4" runat="server" />
 <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />

In code behind:

 public enum BitFlag : byte
        {
            First = 1,
            Second = 2,
            Third = 4,
            Fourth = 8
        }
        public  void CheckFlag(BitFlag bFlag)
        {
            if ((bFlag & BitFlag.First) == BitFlag.First)
                CheckBox1.Checked = true;
            if ((bFlag & BitFlag.Second) == BitFlag.Second)
                CheckBox2.Checked = true;
            if ((bFlag & BitFlag.Third) == BitFlag.Third)
                CheckBox3.Checked = true;
            if ((bFlag & BitFlag.Fourth) == BitFlag.Fourth)
                CheckBox4.Checked = true;
          
        }

   protected void Button1_Click(object sender, EventArgs e)
        {
            BitFlag bFlag = new BitFlag();//= BitFlag.First;
            if (CheckBox1.Checked)
                bFlag |= BitFlag.First;
            if (CheckBox2.Checked)
                bFlag |= BitFlag.Second;
            if (CheckBox3.Checked)
                bFlag |= BitFlag.Third;
            if (CheckBox4.Checked)
                bFlag |= BitFlag.Fourth;
              CheckFlag(bFlag);

        }

Thanks
Mahesh