How to get out integer from database using IDataReader and Mapper - asp.net

Question

I'm very new in programming and this is my first post (question) here, so please don't judge me.
I'm trying to build my first individual WCF service for my project. Let me first display my code , so it will be easier to understand.
This is my data access layer:
public class DataAccessLayer : IDisposable
{
string DBConnectionString = "DBCS";
public int ValidateUser(string employeeLogin, string employeePassword)
{
int outputResult = 0;
try
{
DatabaseProviderFactory factory = new DatabaseProviderFactory();
Database db = factory.Create(DBConnectionString);
string storedProcedureName = "uspValidateUser";
DbCommand dbCommand = db.GetStoredProcCommand(storedProcedureName);
db.AddInParameter(dbCommand, "#EmployeeLogin", DbType.String, employeeLogin);
db.AddInParameter(dbCommand, "#EmployeePassword", DbType.String, employeePassword);
db.AddOutParameter(dbCommand, "#OutRes", DbType.Int32, outputResult);
using (IDataReader reader = db.ExecuteReader(dbCommand))
{
Mapper.Reset();
Mapper.CreateMap<IDataReader, Int32>();
outputResult = (int)Mapper.Map<IDataReader, Int32>(reader);
}
}
catch (Exception ex)
{
throw ex;
}
return outputResult;
}
public void Dispose()
{
}
}
This is my stored procedure:
ALTER PROCEDURE [dbo].[uspValidateUser]
#EmployeeLogin VARCHAR(20),
#EmployeePassword VARCHAR(20),
#OutRes int Output
AS
SET #OutRes = (select count(*)
from dbo.tblEmployee
where EmployeeLogin = #EmployeeLogin
and EmployeePassword = #EmployeePassword)
if (#OutRes = 1)
BEGIN
SET NOCOUNT ON;
set #OutRes = 1 --Login is correct
end
else
BEGIN
set #OutRes = 0 -- Login is incorrect
END
And code behind my web form:
public int ValidateUser(string employeeLogin, string employeePassword)
{
int outputResults = 0;
try
{
using (HospitalWCFService.ContractsClient objWCFService = new HospitalWCFService.ContractsClient())
{
outputResults = objWCFService.ValidateUser(employeeLogin, employeePassword);
}
}
catch (Exception ex)
{
lgnEmployeeLogin.FailureText = ex.Message;
}
return outputResults;
}
protected void ValidateUser(object sender, AuthenticateEventArgs e)
{
int outputResults = 0;
outputResults = ValidateUser(lgnEmployeeLogin.UserName, lgnEmployeeLogin.Password);
if (outputResults == 1)
{
Session["UserName"] = lgnEmployeeLogin.UserName.ToString();
FormsAuthentication.RedirectFromLoginPage(lgnEmployeeLogin.UserName, lgnEmployeeLogin.RememberMeSet);
}
else
{
lgnEmployeeLogin.FailureText = "Username and/or password is incorrect.";
}
}
To get user credentials I'm using login control lgnEmployeeLogin.
I'm having problems of retrieving that output integer #OutRes parameter from database using Mapper (I need to use mapper)
If it is possible, please explain solution in easiest language possible as I might not understand difficult technical slang.
Thank you all in advance!

Answer 1

Your lack of answers could be because you say that you have to use mapper - but I chose to ignore that, because ExecuteReader is for dealing with the rows and columns returned by a stored procedure, not for its output parameters. The stored procedure you provided has no result set!
This could be as simple as
db.ExecuteNonQuery();
OutputResult = db.Parameters( "#OutRes").value
to be clear, this replaces your using...ExecuteReader block
Also note: your code did not deal with opening (and closing) the SQL connection (db.Connection.Open();, so I ignored that here too.