Get the value from Output parameter C# - sql

Question

hi i'm try to create sp in sql with output value
this is the code
ALTER PROCEDURE [dbo].[usp_SelectHospital_IfExiste_Department]
#HospitalDepartmentID INT,
#IfExiste INT OUTPUT
AS
SET NOCOUNT ON
SET TRANSACTION ISOLATION LEVEL READ COMMITTED
IF NOT EXISTS (SELECT c.DeptID FROM Clinic c WHERE DeptID=#HospitalDepartmentID )
BEGIN
SET #IfExiste=0
SELECT
[HospitalDepartmentID],
[NAME]
FROM
[dbo].[Hospital_Department]
WHERE
[HospitalDepartmentID] = #HospitalDepartmentID
END
ELSE
BEGIN
SET #IfExiste=1
SELECT
[HospitalDepartmentID],
[NAME]
FROM
[dbo].[Hospital_Department]
WHERE
[HospitalDepartmentID] = #HospitalDepartmentID
END
and the C# code
public static Hospital_Department GetDepartmentInfo(int ID,int OutIfExist)
{
SqlCommand cmd;
SqlDataReader dr;
Hospital_Department HD = new Hospital_Department();
using (cmd = new SqlCommand("usp_SelectHospital_IfExiste_Department", ProjectCon.GetCon()))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#HospitalDepartmentID", ID);
//cmd.Parameters.Add("#IfExiste",SqlDbType.Int).Direction = ParameterDirection.Output;
cmd.Parameters.Add("#IfExiste",SqlDbType.Int);
cmd.Parameters["#IfExiste"].Direction = ParameterDirection.Output;
dr = cmd.ExecuteReader();
while (dr.Read())
{
HD.NAME = dr["NAME"].ToString();
HD.HospitalDepartmentID = Convert.ToInt32(dr["HospitalDepartmentID"]);
}
OutIfExist = Convert.ToInt32(cmd.Parameters["#IfExiste"].Value);
return HD;
}
}
when i try to get the output value is always null
and i run the stored procedure in sql Was run and return the value
so plz tell me what's wrong in my code
thx

Answer 1

Maybe this question has useful info:
According to, http://msdn.microsoft.com/en-us/library/ms971497, you must close the datareader before you process the output parameters.
Hope it helps.