String to Byte method

Hi all

I have this myReadFile Method that takes a path and outPut a byte array..

How can I modify the same method to take in String character

Since I this function in the message body that return a string value
string parseDocResult = "";
StreamReader reader = new StreamReader((Stream)msgInvoiceDoc[0].RetrieveAs(typeof(Stream)));
parseDocResult = reader.ReadToEnd();

Hence I will call
 myReadFile(parseDocResult);

Thereby eliminating the part
FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);

Thanks for your feeback

Regards

public static byte[] myReadFile(string filePath)
		{
			byte[] buffer;
			FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);

			try
			{
				int length = (int)fileStream.Length;  // get file length
				buffer = new byte[length];            // create buffer
				int count;                            // actual number of bytes read
				int sum = 0;                          // total number of bytes read

				// read until Read method returns 0 (end of the stream has been reached)
				while ((count = fileStream.Read(buffer, sum, length - sum)) > 0)
					sum += count;  // sum is a buffer offset for next reading
			}
			finally
			{
				fileStream.Close();
			}
			return buffer;
		}

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