Merge two datatable as a single one

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C#

ASP.NET

merge two data table with same row into single one,but the condition for the table differs.
"i have set that data table as a data set because i m using two select query"
For instance,

tbl 1
S.no, MeetingName,Assigned by
1 abc A
2 wer A


tbl 2
S.no, MeetingName,Assigned by
1 abc B
2 wer B


I want it as
S.no, MeetingName,Assigned by
1 abc A
2 wer A
3 abc B
4 wer B