aResult = functionsMysql.getArray(query);
 
 
class functionsMysql
{
 
function getArray (string query)
{
 
...connect and execute query
while(Reader.Read())
{
...fill...
}
 
}
 
}

        public void BuildDynamicTableArrayExample()
        {
            DataTable dt = new DataTable(); // table to hold each record
            dt.Columns.Add(new DataColumn("FieldName1", typeof(string))); // Create a string column dynamically
            dt.Columns.Add(new DataColumn("FieldName2", typeof(int))); // create an int column dyn
            dt.Columns.Add(new DataColumn("FieldName3", typeof(double))); // create a double column dyn
            for (int r = 0; r < 10; r++) // generate 10 rows of data
            {
                DataRow dr = dt.NewRow();   // create a row object of table's type defined above
 
                dr["FieldName1"] = "data " + r; // add some data...
                dr["FieldName2"] = r;
                dr["FieldName3"] = (double)r;
 
                dt.Rows.Add(dr); // add the row to the table
            }
        }

public class Result
    {
        int rowNumber;
        string fieldName;
        string value;
 
        public Result(int rorNumber, string fieldNumber, string value)
        {
            // assign variables
        }
    }

public class Result2
    {
        int rowNumber;
        string fieldName;
        string value;
        string whatever;
 
        public Result2(int rorNumber, string fieldNumber, string value, string whatever)
        {
            // assign variables
        }
    }

List<object> resultSet = new List<object>();
.. or
List<SomeBaseClass> resultSet = new List<SomeBaseClass>();

resultSet.Add(new Result(1, "someName", "someValue"));
resultSet.Add(new Result2(1, "someName", "someValue", "something else"));

        public class FieldValues
        {
            public int Row { get; set; }
            public string FldName { get; set; }
            public object FldRowValue { get; set; } // don't know its type yet
 
            public FieldValues(int row, string fldName, object value)
            {
                Row = row;
                FldName = fldName;
                FldRowValue = value;
            }
        }
        List<FieldValues> fieldValues = new List<FieldValues>();
 
        public void AddAnItem(int row, string fldName, object value)
        {
            fieldValues.Add(new FieldValues(row, fldName, value));
        }