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Thanks! but I have this error: Error 1 'System.Linq.ParallelEnumerable.OfType<TResult>(System.Linq.ParallelQuery)' is a 'method', which is not valid in the given context

user5814565
– user5814565

2016-02-09 08:58:31 +00:00
Commented Feb 9, 2016 at 8:58
@SaberJalilzadeh this should actually be System.Linq.Enumerable.OfType<TResult>. Can you check your using statements?

René Vogt
– René Vogt

2016-02-09 09:00:28 +00:00
Commented Feb 9, 2016 at 9:00
@SaberJalilzadeh added a non-linq version to my answer.

René Vogt
– René Vogt

2016-02-09 09:05:04 +00:00
Commented Feb 9, 2016 at 9:05
I have these using statements: using System.Linq; and using System.Xml.Linq;

user5814565
– user5814565

2016-02-09 09:09:03 +00:00
Commented Feb 9, 2016 at 9:09
@SaberJalilzadeh This is an interesting problem...I don't know why your compiler does not choose Enumerable.OfType...works fine here. Your TreeNodes are System.Windows.Forms.TreeNode?

René Vogt
– René Vogt

2016-02-09 09:13:48 +00:00
Commented Feb 9, 2016 at 9:13

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```
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