C# ADO.NET Stored Procedure with Return Value

 public static int GetUserCourseCompletedPercentage(int courseid, string userid)
    {
        int percent = 0;
        string connstring = ConfigurationManager.ConnectionStrings["umbracodb"].ConnectionString;
        SqlConnection conn = new SqlConnection(connstring);
        SqlCommand command = new SqlCommand("GetUserCourseCompletedPercent", conn);
        command.CommandType = CommandType.StoredProcedure;
       
        command.Parameters.AddWithValue("@UserEmail", userid);
        command.Parameters.AddWithValue("@CourseId", courseid);
        SqlParameter returnedvalue = new SqlParameter("@RETURN_VALUE", SqlDbType.Int);
        returnedvalue.Direction = ParameterDirection.ReturnValue;
        command.Parameters.Add(returnedvalue);
        conn.Open();
        SqlDataReader dr = command.ExecuteReader();
        percent = Convert.ToInt16(returnedvalue.Value);
        conn.Close();

        return percent;
    }