Getting parameter in ADO.Net exception when calling from angular - asp.net-mvc

Question

I had created an API in Dot net core. When I had tested it's working well & good through postman or ARC tools. But when calling from angular, It's throwing an sqlexception like : "An SqlParameter with parameter name #TotalRows is not contained by the SqlParameterCollection."
My wonder is how it's working in postman & why not in angular call.
My API dataaccess is like below :
public List<PoDetails> GetPoDetails(PoDetails pods, string vendor_id, out int TotalRows, int Timezone)
{
List<PoDetails> posList = new List<PoDetails>();
TotalRows = 0;
try
{
con = new SqlConnection(conString);
cmd = new SqlCommand("sp_cc_get_po_details", con);
cmd.Parameters.Clear();
cmd.CommandType = CommandType.StoredProcedure;
cmd = Util.AddConditionalParameterString(cmd, "#vendor_id", vendor_id);
cmd = Util.AddConditionalParameterString(cmd, "#sortBy", pods.sortBy);
cmd = Util.AddConditionalParameterString(cmd, "#sortDirection", pods.sortDirection);
cmd = Util.AddConditionalParameterInt(cmd, "#pageSize", pods.pageSize);
cmd = Util.AddConditionalParameterInt(cmd, "#page", pods.page);
cmd = Util.AddConditionalParameterInt(cmd, "#time_zone_offset", Timezone);
cmd.Parameters.Add(new SqlParameter("#TotalRows", SqlDbType.Int));
cmd.Parameters["#TotalRows"].Direction = ParameterDirection.Output;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
TotalRows = Convert.ToInt32(cmd.Parameters["#TotalRows"].Value);
foreach (DataRow dr in dt.Rows)
{
PoDetails posobj = new PoDetails();
posobj.vendor_name = dr["vendor_name"].ToString();
posobj.create_date = Convert.ToDateTime(dr["create_date"].ToString());
posobj.po_id = Convert.ToInt32(dr["po_id"]);
posobj.po_amount = Convert.ToInt32(dr["po_amount"]);
posobj.invoice_count = Convert.ToInt32(dr["invoicecount"]);
if (dr["utilization_amount"] != DBNull.Value)
posobj.utilization_amount = Convert.ToInt32(dr["utilization_amount"]);
else
posobj.utilization_amount = 0;
posList.Add(posobj);
}
}
catch (Exception ec)
{
throw new Exception(ec.Message);
}
return posList;
}
My procedure was like below :
ALTER PROCEDURE [dbo].[sp_cc_get_po_details]
(
#vendor_id varchar(100) = null,
#sortBy varchar(50) = NULL,
#sortDirection varchar(50) = null,
#pageSize int = NULL,
#page int = NULL,
#TotalRows int = NULL output,
#time_zone_offset int = 0
)
AS
BEGIN
SELECT Count(I.invoice_id) as invoicecount, p.po_id,p.po_amount,p.vendor_id,
DATEADD(MINUTE, #time_zone_offset, p.create_date) AS create_date ,
v.vendor_name, sum(I.invoice_amount) as utilization_amount
into #TempResults
FROM po_details p left join invoice_details I on p.po_id = I.po_id
join vendor_details v on v.vendor_id = p.vendor_id
WHERE (#vendor_id is null or #vendor_id = '' or v.vendor_id = #vendor_id)
group by p.po_id, p.po_amount, p.vendor_id, p.create_date, v.vendor_name
-- Paging Logic --
Declare #StartingRow as int = 0
Declare #FirstRow as int
Declare #LastRow as int
select #TotalRows = count(*)
from #TempResults
set #StartingRow = (#pageSize * #page) + 1
if #pageSize is not null and #page is not null begin
set #FirstRow = ((#page - 1) * #pageSize) + 1
set #LastRow = #FirstRow + (#pageSize - 1)
end else if #pageSize is not null and #StartingRow is not null begin
set #FirstRow = #StartingRow
set #LastRow = #FirstRow + (#pageSize - 1)
end else begin
set #FirstRow = 0
set #LastRow = #TotalRows
end
------
-------------------
--select #FirstRow;
--select #LastRow;
Select * from
(
Select ROW_NUMBER() over
(
order by
case when #sortBy = 'vendor_id' and #sortDirection = 'desc' then vendor_id end desc,
case when #sortBy = 'vendor_id' and #sortDirection = 'asc' then vendor_id end asc,
case when #sortBy = 'vendor_name' and #sortDirection = 'desc' then vendor_name end desc,
case when #sortBy = 'vendor_name' and #sortDirection = 'asc' then vendor_name end asc,
vendor_id
) as RowNumber, * from #TempResults
) RowData
where RowNumber between #FirstRow and #LastRow
order by RowNumber
end