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MVC

hi iam use project mvc with code first
i have two table
http://stackoverflow.com/questions/28140020/how-show-calculations-a-dynamic-field-on-webgrid[^]

 #group
 id       name  
 1        test1
 2        test2
 3        test3
 table 2
#subgroup  
  idsub      idgroup         namesub
   1            1            name1
   2            1            name2
   3            2            name3
   4            3            name4
   5            3            name3
   6            3            name3
   7            1            name3

i want this result in webgrid mvc .how use item countgroup in web grid
id countgroup
1 3
2 1
3 3