How to merge column from two data table in gridview

Hi i had three in dataset i want merge column for all three datatable on to display gridview pls post your answer,gridview column is dyanamic creation from depending on selected column i using below stored procedure

DECLARE @query nVARCHAR(max)

DECLARE @column nVARCHAR(max)

DECLARE @TotalPresent int

DECLARE @total int

DECLARE @per decimal

declare @i int

SELECT @column = STUFF(( SELECT'],['+ Tradecat FROM mstr_tradecategory order by '],[' + convert(nVARCHAR(max),UniqueID) FOR XML PATH('')), 1, 2, '') + ']'

SET @query ='SELECT State,' + @column + ' FROM(

SELECT State,Tradecat FROM dbo.mstr_workforce as wf

inner join mstr_state as st on wf.PresentState=st.StateCode

left outer join mstr_tradecategory as tc on tc.TrcatCode=wf.Category

left outer join workforce_attendance as wa on wa.WorkforceID=wf.WorkforceId where wa.AttendanceDate=convert(varchar(20),getdate(),100)) mstr_workforce

PIVOT (count(Tradecat) FOR Tradecat IN ('+@column+')) AS pvt'

(select COUNT(presentState)as TotalPresent from mstr_workforce as wf left outer join workforce_attendance as wa on wa.WorkforceID=wf.WorkforceId where wa.AttendanceDate='05-16-2015' group by presentState)

(select COUNT(presentState)as Total from mstr_workforce as wf left outer join workforce_attendance as wa on wa.WorkforceID=wf.WorkforceId group by presentState)

EXECUTE (@query)