Dynamic Checkbox in ASP.NET (Return checkbox value in comma seperated format)

In .aspx File:

<asp:Label ID="lblSelectedValues" runat="server" Text="" style="color: #FF3300"/>

<asp:CheckBoxList ID="AccCheckBoxList" runat="server" RepeatColumns="2" Height="55px" Width="239px" RepeatLayout="Table" BorderColor="Red" BorderStyle="Dotted" BorderWidth="4px">

           </asp:CheckBoxList>

<asp:CheckBoxList ID="AccCheckBoxList" runat="server" RepeatColumns="2" Height="55px" Width="239px" RepeatLayout="Table" BorderColor="Red" BorderStyle="Dotted" BorderWidth="4px">

           </asp:CheckBoxList>

In .aspx.cs File:

private void GetAccListCheckBox()

    {

        DataTable dt = new DataTable();

        dt = empManagerObj.GetAccList();

        AccCheckBoxList.DataSource = dt;

        AccCheckBoxList.DataTextField = "accessories_name";

        AccCheckBoxList.DataValueField = "id";

        AccCheckBoxList.DataBind();

    }

    protected void BtnGetSelectedValues_Click(object sender, EventArgs e)

    {

        if (AccCheckBoxList.SelectedIndex != -1)

        {

            lblSelectedValues.Text = "Selected values are = " + GetCheckBoxListSelections();

        }

        else

        {

            lblSelectedValues.Text = "Please select any course";

        }

    }

    private string GetCheckBoxListSelections()

    {

        string[] cblItems;

        ArrayList cblSelections = new ArrayList();

        foreach (ListItem item in AccCheckBoxList.Items)

        {

            if (item.Selected)

            {

                cblSelections.Add(item.Value);

            }

        }

        cblItems = (string[])cblSelections.ToArray(typeof(string));

        return string.Join(",", cblItems);

    }

    protected void btnClearSelection_Click(object sender, EventArgs e)

    {

        AccCheckBoxList.ClearSelection();

        lblSelectedValues.Text = string.Empty;

    }