i wan create a datatable complex like tis 1!any1 can teach me how to do it?

The datatable consist 5 datacolumn(col1,col2,col3,col4 and col5)

the data of row of col1,col3 and col5 is fix("A","Book","100") and tis same data will insert into 30 row (when the ds.Tables(0) got 30 row)

the data of row of col2 and col4 is take from ds.Tables(0).

The example that show at txt.file is like below:

col1 ,col2 ,col3 ,col4 ,col5

A ,ds.Tables(0).Rows(i) ,Book ,ds.Tables(0).Rows(i) ,100

A ,ds.Tables(0).Rows(i) ,Book ,ds.Tables(0).Rows(i) ,100

A ,ds.Tables(0).Rows(i) ,Book ,ds.Tables(0).Rows(i) ,100

A ,ds.Tables(0).Rows(i) ,Book ,ds.Tables(0).Rows(i) ,100

A ,ds.Tables(0).Rows(i) ,Book ,ds.Tables(0).Rows(i) ,100

Thanks....

i hope can get any suggestion.Please...

Thanks:)