How to parse out information of WMV file in C#

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C#

file

binary

I want to get information of ASF file as bitrate, metadata, language...I have read ASF Specification and know a ASF file has parts : Header Object, Data Object, Index Object. At frist, I think ASF file's binary file and i try to solve by CLASS and FUNCTION in C# as : FileStream, BinaryReader :

String path = @"E:\KhoaLuanTN\Streaming video server\video\encoder_ad.wmv";
            FileStream filer = File.OpenRead(path);
            BinaryReader br = new BinaryReader(filer);         
            byte [] file = br.ReadBytes(100);

Then, I try to convert into String :

<pre lang="midl">textBox1.Text = Encoding.ASCII.GetString ( file );

But it doesn't display as I expect. It displays a nonsensical string: 0&?u?f? ??.
So please show me how to convert information in a ASF file into String.