The SqlParameter is already contained by another SqlParameterCollection.3

Question

This is my first question: The SqlParameter is already contained by another SqlParameterCollection. SqlDataReader rdr[0] vs. object brings me table columns values.

    public ArrayList[] GetInfo(string sqlCommand, SqlParameter sqlParameter)
    {
        ArrayList[] drawingInfo = new ArrayList[7];
        drawingInfo[0] = new ArrayList();
        drawingInfo[1] = new ArrayList();
        drawingInfo[2] = new ArrayList();
        drawingInfo[3] = new ArrayList();
        drawingInfo[4] = new ArrayList();
        drawingInfo[5] = new ArrayList();
        drawingInfo[6] = new ArrayList();
        using (SqlConnection con = new SqlConnection("connectionAdres"))
        {
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            cmd.CommandText = sqlCommand;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Add(sqlParameter);
            con.Open();
            SqlDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())
            {
                drawingInfo[0].Add(rdr[0]);
                drawingInfo[1].Add(rdr[1]);
                drawingInfo[2].Add(rdr[2]);
                drawingInfo[3].Add(rdr[3]);
                drawingInfo[4].Add(rdr[4]);
                drawingInfo[5].Add(rdr[5]);
                drawingInfo[6].Add(rdr[6]);
            }
            return drawingInfo;
        }
    }

Answer 1

You cant call GetInfo method twice with the same object as parameter. Pass only value to the method and build the SqlParameter each time again. The same as you do with SqlCommand.