c# - GroupBy in LINQ -

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I need a table group by month

The query is made in this way: 

  var query = from db.bt to db.facts where a.Count_Key == b.Date_key new {A.Month, b.Fact_key};   
 From this query I'm trying the month group  
  query = query.GroupBy (x => x.Month); Grid1.DataSource = Query; Grid1.DataBind ();   
 Then I get the following error which says:  
 
 Can IGrouping int be converted? In IQueryable    
 
 
 You can:  
  Var query2 = query.GroupBy (x => x.Month); Grid1.DataSource = query2; Grid1.DataBind ();   
 The problem arises because the  var query  is inherently assumed by its use.  query  type  IQueryable & lt; SomeAnonymousType & gt;  and  GroupBy  method one  IQueryable . These are just two different types.

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