c# file and folder method

DirectoryAndFileUtils.cs

public class DirectoryAndFileUtils
    {
        public byte[] ReadFile(string path)
        {
            try
            {
                byte[] readBuffer = File.ReadAllBytes(path);
                return readBuffer;
            }
            catch (IOException e)
            {
                throw e;
            }
        }

        public void CopyFile(string sourceFileToCopyPath, string destinationPath)
        {
            if (IsFileExist(sourceFileToCopyPath) == true)
            {
                File.Copy(sourceFileToCopyPath, destinationPath);
            }
        }

        public void SaveFile(string path, byte[] file)
        {
            using (FileStream fs = File.Create(path))
            {
                for (byte i = 0; i < file.Length; i++)
                {
                    fs.WriteByte(file[i]);
                }
            }
        }

        public string GetFilfeName(string path)
        {
            return Path.GetRandomFileName();
        }

        public bool IsFileExist(string path)
        {
            return File.Exists(path);
        }

        public DirectoryInfo CreateFolder(string path)
        {
            return Directory.CreateDirectory(path);
        }

        public void SaveTextFile(string folderPath, string fileName, string text)
        {
            if (!IsFolderExist(folderPath))
            {
                CreateFolder(folderPath);
            }
            var filePath = Path.Combine(folderPath, fileName);
            FileStream fParameter = new FileStream(filePath, FileMode.Create, FileAccess.Write);
            StreamWriter m_WriterParameter = new StreamWriter(fParameter);
            m_WriterParameter.BaseStream.Seek(0, SeekOrigin.End);
            m_WriterParameter.Write(text);
            m_WriterParameter.Flush();
            m_WriterParameter.Close();
        }

        public void DeleteFolder(string path)
        {
            if (IsFolderExist(path))
            {
                Directory.Delete(path);
            }
        }

        public bool IsFolderExist(string path)
        {
            return Directory.Exists(path);
        }
    }