How to call a output parameter in Web API using post method

Question

I have a stored procedure that adds a new entry to a table and OUTPUTS the `TransactionId` (as int) to `@TransactionId`.

Here I want to retrieve the output parameter from a stored procedure in Entity Framework (EDMX)

(i found several questions like this but I could not grasp because I am new in web API)

I can exec the procedure just fine to the ASP.NET backend using Postman but I can't get the OUTPUT (parameter to return). I don't know how to capture the OUTPUT in the C# post method.

For clarification, I'm trying to exec a stored procedure and capture the output using entity framework. I don't know how to capture or call the output parameter in web API to display.

 

     My API code is

[HttpPost]

public void Stock([FromBody] List<spGetNewStockCountHeader_Result> jsonvalues)

{

foreach (spGetNewStockCountHeader_Result Datastock in jsonvalues)

{

ObjectParameter TransactionId = new ObjectParameter("TransactionId", typeof(Int32));

spGetNewStockCountHeader_Result Stockobject = new spGetNewStockCountHeader_Result();

Stockobject.UserID = Datastock.UserID;

Stockobject.created = Datastock.created;

Stockobject.CompanyID = Datastock.CompanyID;

Stockobject.modified = Datastock.modified;

Stockobject.modifieduserid = Datastock.modifieduserid;

Stockobject.confirm = Datastock.confirm;

Stockobject.ShopId = Datastock.ShopId;

enqentities.spGetNewStockCountHeader(Datastock.UserID, Datastock.created,

Datastock.CompanyID, Datastock.modified, Datastock.modifieduserid, Datastock.confirm,

Datastock.ShopId, TransactionId);

}

}