C# Very Large String Manipulation (Out of Memory Exception)

Question

I have a need to read in a 1gb raw text file from disk to ram to do some string manipulation in C#.

string contents = File.ReadAllText(path)

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Answer 1

I was using ReadAllText for 109 mb file and was getting out of memory which is really odd. Anyway, so I used buffer to read file with good performance and StringBuilder to make it memory efficient. Here is my code:

                StringBuilder sb = new StringBuilder();
                using (FileStream fs = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                using (BufferedStream bs = new BufferedStream(fs))
                using (StreamReader sr = new StreamReader(bs))
                {
                    string line;                    
                    while ((line = sr.ReadLine()) != null)
                        sb.AppendLine(line);
                }