title: c# Compilation Error
body: <p>I'm doing image steganography and visual cryptography project using RSA algorithm. While compiling the project I'm getting these errors:</p>
  
  <blockquote>
    <p>ArgumentException was unhandled</p>
  </blockquote>
  
  <p>and also </p>
  
  <blockquote>
    <p>Empty path name is not legal</p>
  </blockquote>
  
  <p>This error shown in:</p>
  
  <pre><code>FileStream outStream = 
      new FileStream(stegoFileName, FileMode.Create, FileAccess.Write);
  </code></pre>