error 'there is already an open datareader associated with this command which must be closed first'

Question

runtime error \'there is already an open datareader associated with this command which must be closed first\'

objCommand = new SqlCommand(\"SELECT field1, fi         


        

Answer 1

Your best bet would be to read the information you need into a list and then iterating the list to perform your inserts like so:

        List values = new List();
        using(SqlCommand objCommand = new SqlCommand("SELECT field1, field2 FROM sourcetable", objConn)) {
            using(SqlDataReader objDataReader = objCommand.ExecuteReader()) {
                while(objDataReader.Read()) {
                    values.Add(objDataReader[0].ToString());
                }
            }
        }
        foreach(String value in values) {
            using(SqlCommand objInsertCommand = new SqlCommand("INSERT INTO tablename (field1, field2) VALUES (3, '" + value + "')", objConn)) {
                objInsertCommand.ExecuteNonQuery();
            }
        }