c# - How can I make DataTable enumerable? -

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I can not use asEnumerable () on DataTable, I am using C # 3 but I'm just targeting 2.0 framework (LINQ capacity). ) Is there any way I can make dataable calculable without using the selection ()? 

  bool isExisting = (Datasource as DATATAS). Choose (). Any (xxx => (string) dr ["filename"] == file name);

Update:

I wanted to show it like this: 

  bool isExisting = (bdsAttachments.DataSource as DataTable ) .Asnumerable (). Any (xx = & gt; (string) dr ["filename"] == filename); I'm getting a hint that the DataTable selection method copies, I'm just thinking about using AsEnumerable, the problem is that I'm just 2.0 frameworks, the system . I'm targeting data. Dataset extension is not available  
 BTW, I tried to do this :, but there are compilation errors in it.   
 
   public static IEnumerable & lt; DataRow & gt; Enemerate RO (this datatable table) {foreach (rows in table .ro) {returns the row of returns; }}

allows you to call: 

  bool isExisting = (bdsAttachments.DataSource as DataTable). Any (dr = & gt; (string) dr ["filename"] == file name);

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