How to create dynamic Linq to SQL in Vb.net

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VB

I have inline and dynamic SQL query like

Dim SQL as string ="sSelect" & Top & "i1.f1,i2.f2" & sselect & 
"from table1 i1 inner join table i2 on i1.eventseriesID=i2.eventseriesID " & Sjoin &
& " where i1.binheritseries=1 "

if where <>"" then
SQL &="order By" & OrderBy
End if

In this Top,sselect,Sjoin are extra selected fields ,fields and additional Join sequentially.
Now i want this query as LINQ using dbml file with correct table association and string expression linq.I tried to get help from above link
http://stackoverflow.com/questions/13995212/technique-for-dynamically-adding-a-join-to-a-linq-query[^]
But i couldnt succeed.Please tell me anybody Its very urgent