how to use out put parameter in business logic to pass to sp

Do the following steps (add additional input parmas if any):-

using (SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=test;Integrated Security=True"))
using (SqlCommand cmd = new SqlCommand("SPname", con))
{
    cmd.CommandType = CommandType.StoredProcedure;

    cmd.Parameters.Add(new SqlParameter("@opparam1", SqlDbType.Int));
    cmd.Parameters["@opparam1"].Direction = ParameterDirection.Output;

    con.Open();
    cmd.ExecuteNonQuery();
    int outputvalue = (int)cmd.Parameters["@opparam1"].Value;
    con.Close();
}

public class b_GroupTest
{

SqlHelper sh = new SqlHelper();
public DataSet TestQuestions(GroupTest Gt)
{
DataSet ds = new DataSet();
try
{
SqlParameter[] param ={
new SqlParameter("@TotalQuestions",Gt.NoofQuestions),
new SqlParameter("@Companyid",Gt.comp),

};

return ds = sh.ExecuteDataset("dbo.Sp_GetQuestions", param);

}
catch (Exception ex)
{ }
return ds;

}
}

here i have pass2 parameter one input as company and a parameter bu which i get the output value .