title: Stringbuilder adding % to end of URL
body: <p>I have a slight issue with a string being built in my code. When I debug my page the url is incorrect. For example Google's url is this when clicking on the link on my page. <a href="http://www.google.co.uk%22%22/" rel="nofollow">http://www.google.co.uk%22%22/</a></p>
  
  <p>See below for code.</p>
  
  <pre><code>sb.Append(@"&lt;a href=" + r["Url"].ToString() + "\"" + @""" target=""blank""&gt;");
  sb.Append(@"&lt;img src=""../ShowImage.ashx?id=" + r["Image_id"] + "\" title=\"" + r["Title"].ToString() + "\"  alt=\"" + r["Alt_text"].ToString() + "\"  &gt;");
  sb.Append("&lt;/a&gt;");
  </code></pre>
  
  <p>Is there a mistake in how I am building my string?</p>
  
  <p>Thanks.</p>