Dynamically Generate Multiple CheckBox and send all checked checkbox Ids as a string to server...

 <p><asp:CheckBoxList ID="lstFundGroup" runat="server">
    </asp:CheckBoxList></p>

 private void LoadInvestmentGroupName(int id)
        {
             investmentBO = new InvestmentBO();          
            lstFundGroup.DataTextField = "GroupName";
            lstFundGroup.DataValueField = "GroupID";
            lstFundGroup.DataSource = investmentBO.GetInvestmentGroupName(id);
            lstFundGroup.DataBind();
        }

 protected void btnSearchFunGruop_Click(object sender, EventArgs e)

        {

            int i;

            string idFundGroup ="";

            for (i = 0; i < lstFundGroup.Items.Count; i++)

            {

                if (lstFundGroup.Items[i].Selected)

                {

                    idFundGroup = idFundGroup + lstFundGroup.Items[i].Value.ToString() + ",";

                }

            }

            idFundGroup = idFundGroup.Substring(0, idFundGroup.Length - 1);

        }