基于Asp.net C＃中的selecteditem，不会删除AspxCheckbox列表中的所选项目

Question

I want to remove single or grouped selected items from the AspxCheckbox list control(devexpress control) by button click. I am using the following code. It deleted the first single selected item fine. When I select 5 items(index 5, 6, 7,8) among 10. it starts to delete from 5th position to top positioned items(index 5, 4, 3) which are not selected. Please help me fix this.

protected void cbpNDTStaffs_Callback(object sender, DevExpress.Web.CallbackEventArgsBase e)
    {
        if (e.Parameter == "RemoveNDTStaff")
        {
            string Message = string.Empty;

            int i;
            for (i = 0; i <= ChklstNDTStaffs.SelectedItems.Count - 1; i++)
            {
                string EmpIDAndName = string.Empty;
                string EID = "";
                if (ChklstNDTStaffs.SelectedItems[i].Selected)
                {
                    EmpIDAndName = Convert.ToString(ChklstNDTStaffs.SelectedItems[i].Text);
                    EID = Convert.ToString(ChklstNDTStaffs.SelectedItems[i].Value);

                    Int64 ReturnValue = DataAccess.NDTDataAccess.UpdateNDTStaffs(EID, CurrentlyLoggedUserName);

                    if (ReturnValue > 0)
                    {
                        Message = "Selected NDT Staff(s) Removed Successfully.";
                    }
                }
            }

            if (Message.Length > 0)
            {
                ChklstNDTStaffs.DataBind();
                cbpNDTStaffs.JSProperties["cpIsUpdated"] = Message;
            }
            else
            {
                cbpNDTStaffs.JSProperties["cpIsUpdated"] = "";
            }
        }

Answer 1

for (i = 0; i <= ChklstNDTStaffs.Items.Count - 1; i++)
        {
            string EmpIDAndName = string.Empty;
            string EID = "";
            if (ChklstNDTStaffs.Items[i].Selected==true)
            {
                EmpIDAndName = Convert.ToString(ChklstNDTStaffs.Items[i].Text);
                EID = Convert.ToString(ChklstNDTStaffs.Items[i].Value);

                Int64 ReturnValue = DataAccess.NDTDataAccess.UpdateNDTStaffs(EID, CurrentlyLoggedUserName);

                if (ReturnValue > 0)
                {
                    Message = "Selected NDT Staff(s) Removed Successfully.";
                }
            }
        }