Iterate through all SPWeb objects in your farm
Sometimes you need to hit all webs in your SharePoint farm. This is the code how you can achieve this task:
1: SPFarm farm = SPContext.Current.Site.WebApplication.Farm;
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:#f4f4f4;border-bottom-style:none"><span style="color:#606060"> 2:</span> SPWebService service = farm.Services.GetValue<SPWebService>(<span style="color:#006080">""</span>);</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:white;border-bottom-style:none"><span style="color:#606060"> 3:</span> </pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:#f4f4f4;border-bottom-style:none"><span style="color:#606060"> 4:</span> <span style="color:#0000ff">foreach</span> (SPWebApplication webApplication <span style="color:#0000ff">in</span> service.WebApplications)</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:white;border-bottom-style:none"><span style="color:#606060"> 5:</span> <span style="color:#0000ff">foreach</span> (SPSite site <span style="color:#0000ff">in</span> webApplication.Sites)</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:#f4f4f4;border-bottom-style:none"><span style="color:#606060"> 6:</span> {</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:white;border-bottom-style:none"><span style="color:#606060"> 7:</span> <span style="color:#0000ff">foreach</span> (SPWeb web <span style="color:#0000ff">in</span> site.AllWebs)</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:#f4f4f4;border-bottom-style:none"><span style="color:#606060"> 8:</span> {</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:white;border-bottom-style:none"><span style="color:#606060"> 9:</span> RemoveHandlerFromLists(web);</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:#f4f4f4;border-bottom-style:none"><span style="color:#606060"> 10:</span> web.Dispose();</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:white;border-bottom-style:none"><span style="color:#606060"> 11:</span> }</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:#f4f4f4;border-bottom-style:none"><span style="color:#606060"> 12:</span> </pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:white;border-bottom-style:none"><span style="color:#606060"> 13:</span> site.Dispose();</pre>
<pre style="padding-right:0px;padding-left:0px;font-size:8pt;padding-bottom:0px;margin:0em;overflow:visible;width:100%;color:black;border-top-style:none;line-height:12pt;padding-top:0px;font-family:consolas, 'Courier New', courier, monospace;border-right-style:none;border-left-style:none;background-color:#f4f4f4;border-bottom-style:none"><span style="color:#606060"> 14:</span> }</pre>