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I used the below function.īut i want to execute this code only once. So when i tried to run the app i came across with UnauthorizedAccessException because both function maybe were trying to access the file the same time. IList list = await FileIO.ReadLinesAsync(storageFile) īoth functions were async so we could not determine when each function was running and which will be executed first. StorageFile = await storageFolder.CreateFileAsync('file.txt',CreationCollisionOption.OpenIfExists) StorageFile = await storageFolder.CreateFileAsync('file.txt',CreationCollisionOption.ReplaceExisting) Īwait FileIO.AppendTextAsync(storageFile, 'saveSomeText') īut i also had a function in MainPage that asynchronously was reading the same file StorageFolder storageFolder = So i used this code StorageFolder storageFolder = So i added an async function that handles a. I had to upgrade one application and put some extra functionality.

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