c# - Problem with grid when trying to use groupby in LINQ -

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When you try to use GROUPBY, I get an error that states that the field 'date1' is selected Not found on the resource. 

  var query = (Select from db.bt to db.Facts where a.Count_Key == b.Date_key new {a.Date1, a.Month, b.Fact_key} ); Var query2 = query.GroupBy (x => x.Month); Grid1.DataSource = query2; Grid1.DataBind ();   
 Therefore, when I try to bind the query it works perfectly, but the query generates 2 errors  
 
 field date1 Not found on the selected data source.   
 How can I fix this?  
  
 
 
 The group names different from the original selection by return column.  
 You can do the following to see it for "educational purpose".  
 Create a new grid 2 and use it with automatic columnmapping. Divide question 2 into this grid 2 and you will see the result.

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