why am I getting format exception in this code? It has one argument only
<pre><code>public override string ToString()
{
    string val;
    if (blower)
        val = "Yes";
    else
        val = "No";
    return string.Format(
                   "With Blower \t:\t {0} \n" +
                   val);
}
</code></pre>

<p>I am getting an exception in these lines:-</p>

<pre><code> return string.Format(
                "With Blower \t:\t {0} \n" +
                val);
</code></pre>

<p>The exception is:</p>

<blockquote>
  <p>Index (zero based) must be greater than or equal to zero and less than the size of the argument list.</p>
</blockquote>

<p>What am I doing wrong?</p>
