Which file Mode enumerator should john use in the constructor of the file stream class?
<p>John need td write a program in C# for file handling. He wants to write a code to open an existing file. If the file does not exist, an error message should be shown. Which file Mode enumerator should john use in the constructor of the file stream class?</p>

<ol>
<li>Open</li>
<li>OpenOrCreate</li>
<li>CreateNew</li>
<li>Create </li>
</ol>
