Question

I’m trying to join two datatables of same keyfields.

table1

ID     Class    
----   -----
1       10  
2       9   

table2

ID     Class
----   -----
1       8   
2       7   

Result

ID      Class1    Class2
1        10       8
2        9        7

Answer 1

following is code for joining between user and userclients you can replace your table and get the result of join

Follwing image is for the c# but will give you idea in detail

Dim user = From u In Users Join uc In UserClients On u.Id = uc.UserId New From { _
    u.Id, _
    u.FirstName, _
    u.LastName, _
    uc.MobileNo, _
    uc.imeiNO, _
    uc.Id _
}

if you are beginner you can look this :
SQL to LINQ ( Visual Representation )