System.Convert.Convert.ToBase64CharArray C# (CSharp) Method

		public static int ToBase64CharArray (byte[] inArray, int offsetIn, int length, 
						    char[] outArray, int offsetOut)
		{
			if (inArray == null)
				throw new ArgumentNullException ("inArray");
			if (outArray == null)
				throw new ArgumentNullException ("outArray");
			if (offsetIn < 0 || length < 0 || offsetOut < 0)
				throw new ArgumentOutOfRangeException ("offsetIn, length, offsetOut < 0");
			// avoid integer overflow
			if (offsetIn > inArray.Length - length)
				throw new ArgumentOutOfRangeException ("offsetIn + length > array.Length");

			// note: normally ToBase64Transform doesn't support multiple block processing
			byte[] outArr = ToBase64Transform.InternalTransformFinalBlock (inArray, offsetIn, length);
			
			char[] cOutArr = new ASCIIEncoding ().GetChars (outArr);
			
			// avoid integer overflow
			if (offsetOut > outArray.Length - cOutArr.Length)
				throw new ArgumentOutOfRangeException ("offsetOut + cOutArr.Length > outArray.Length");
			
			Array.Copy (cOutArr, 0, outArray, offsetOut, cOutArr.Length);
			
			return cOutArr.Length;
		}