open file failure!Du you want to recover it?如题

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• open file failure!Du you want to recover it?如题
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• if you want to open a file that exists or create it otherwise,which of the following is right?a)FileStream fs=new FileStream(“c:\\myfile.txt”,FileMode.Create,FileAccess.Write);b)FileStream fs=new FileStream(“c:\\myfile.txt”,FileMode.CreateNew,FileAccess.Write);c)FileStream fs=new FileStream(“c:\\myfile.txt”,FileMode.Open,FileAccess.Write);d)FileStream fs=new FileStream(“c:\\myfile.txt”,FileMode.OpenOrCreate,FileAccess.Write);