List<UMSLocationDetails> lstUMSLocationDetails = null;

string strCurrentGroupName = "";
        int intCurrentGroupID = 0;

        if (!string.IsNullOrEmpty(strUsername))
        {
            List<UMSGroupDetails> lstUMSGroupDetails = null;
            List<UMSLocationDetails> lstUMSLocationDetails = null;

            ObjUMS.GetUMSGroups(strUsername, out strCurrentGroupName, out intCurrentGroupID, out lstUMSLocationDetails, out lstUMSGroupDetails);
            if (strCurrentGroupName != "" && intCurrentGroupID != 0)
            {
                string LoginUserName = strUsername.ToUpper();
                string CurrentGroupName = strCurrentGroupName;
                int CurrentGroupID = intCurrentGroupID;
                LocationDetails = lstUMSLocationDetails;

                GetR4GStates(lstUMSLocationDetails);
            }
            else
            {
                //error
            }
        }

private void GetR4GStates(string LocationDetails)
    {
        List<SelectListItem> lstR4GState = new List<SelectListItem>();
        try
        {
            CommonDB ObjCommonDB = new CommonDB();
            DataTable dt = ObjCommonDB.GetR4GState(LocationDetails);

            if (dt.Rows.Count > 0)
            {
                lstR4GState = (from DataRow dr in dt.Rows
                               select new SelectListItem()
                               {
                                   Text = Convert.ToString(dr["R4GSTATENAME"]),
                                   Value = Convert.ToString(dr["R4GSTATECODE"])

                               }).ToList();
            }
            else
            {

                SelectListItem slEmptyData = new SelectListItem();
                slEmptyData.Text = "No Data found";
                slEmptyData.Value = "No Data found";
                lstR4GState.Add(slEmptyData);


            }
        }
        catch (Exception)
        {

            throw;
        }
    }