Contains condition in EF Linq

 private void BindsearchOso()
        {

            if (keyList != null)
            {

                if (keyList.Contains("12") && roles["12"] > 2)
                {
                    var result = db.MstrOSoOfficesMarkets.Where(x => x.IsDeleted == 0).ToList();
                    ddlSearchOso.DataSource = result;
                }
                else
                {
                    var result = db.MstrOSoOfficesMarkets.Where(x => x.IsDeleted == 0).ToList().Where(x => keyList.Contains(x.OSOOfficesMarketsPkID.ToString())).ToList();
                    ddlSearchOso.DataSource = result;
                }

                ddlSearchOso.DataValueField = "OSOOfficesMarketsPkID";
                ddlSearchOso.DataTextField = "Name";
                ddlSearchOso.DataBind();
                ListItem l = new ListItem("Office", "0");
                ddlSearchOso.Items.Insert(0, l);
            }
        }