Why Can't I Access a File After Using File.Create() in C#?

Unable to Access File After Using File.Create(): Understanding the Process Lock

When attempting to write to a file after using the File.Create() method, you may encounter the following error: "The process cannot access the file [...] because it is being used by another process." This issue arises due to an exclusive lock acquired by File.Create().

To resolve this, employ the following code:

File.Create(filePath).Close();
File.WriteAllText(filePath, fileText);

This approach splits the file creation process into two separate actions: creating the file and writing to it. By closing the file immediately after creation, we release the exclusive lock, allowing other processes to access it.

While this solution works, it is not the most efficient method for writing large amounts of text. It is recommended to use other techniques such as File.AppendAllLines() or custom logic to improve performance.

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