joint 2 datatable with column type double with a seperater

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VB

C#3.5

Can anyone please tell me how to merge 2 datatable of column type double with a seperator (|). one with datetime header and 2nd table with integer headers, like this

table 1
01/02/2015 01/03/2015
12346 47894

table 2
1 -- 2
7899 -- 45678

to become

01/02/2015 -- 01/03/2015

12346 | 7899 -- 47894 | 45678

thanks