文件转BASE64码

private string buffer1;
        private string buffer2; 
private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openDlg = new OpenFileDialog();
            openDlg.Filter = "图形文件(*.jpg)|*.gif";
            openDlg.FileName = "";
            openDlg.DefaultExt = ".gif";
            openDlg.CheckFileExists = true;
            openDlg.CheckPathExists = true;            DialogResult res = openDlg.ShowDialog();
            if (res == DialogResult.OK)
            {
                for (int i = 0; i < openDlg.FileNames.Length; i++)
                {
                    buffer1 = openDlg.FileNames[i].ToString();
                }
            }            EncodeWithString();        }        public byte[] EncodeWithString()
        {
            System.IO.FileStream inFile;
            byte[] binaryData;
            try
            {
                inFile = new System.IO.FileStream(buffer1, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                binaryData = new Byte[inFile.Length];
                long bytesRead = inFile.Read(binaryData, 0, (int)inFile.Length);
                inFile.Close();
            }
            catch (System.Exception exp)
            {
                System.Console.WriteLine("{0}", exp.Message);
                return null;
            }
            try
            {
                buffer2 = System.Convert.ToBase64String(binaryData, 0, binaryData.Length);
            }
            catch (System.ArgumentNullException)
            {
                System.Console.WriteLine("Binary data array is null.");
                return null;
            }
            System.IO.StreamWriter outFile;
            try
            {
                outFile = new System.IO.StreamWriter(buffer1, false, System.Text.Encoding.ASCII);
                outFile.Write(buffer2);
                outFile.Close();
            }
            catch (System.Exception exp)
            {
                System.Console.WriteLine("{0}", exp.Message);
            }
            return binaryData;
        }
请问转换后的BASE64码  要引用的值的话 是buffer2吗？