Coding Techniques to Ensure Object Disposal

You can employ certain coding techniques to ensure object disposal. These techniques include using the following in your code:

• Dispose method
  
  
• using clause
  
  
• try, catch, and finally blocks

//code using 'Using'

String str;

using(SPSite oSPsite = new SPSite("http://server"))
{
  using(SPWeb oSPWeb = oSPSite.OpenWeb())
   {
       str = oSPWeb.Title;
       str = oSPWeb.Url;
   }
} 

 //using try/catch/finally

String str;
SPSite oSPSite = null;
SPWeb oSPWeb = null;

try
{
   oSPSite = new SPSite("http://server");
   oSPWeb = oSPSite.OpenWeb(..);

   str = oSPWeb.Title;
}
catch(Exception e)
{
   //Handle exception, log exception, etc.
}
finally
{
   if (oSPWeb != null)
     oSPWeb.Dispose();

   if (oSPSite != null)
      oSPSite.Dispose();
}

//using dispose method

public static void SPSiteCollectionForEachBestPractice()
{
     string sUrl = "http://spvm";
 
      using (SPSite siteCollectionOuter = new SPSite(sUrl))
     {
         SPWebApplication webApp = siteCollectionOuter.WebApplication;
         SPSiteCollection siteCollections = webApp.Sites;

                  SPSite siteCollectionInner = null;
                  foreach (siteCollectionInner in siteCollections)
             {
                      try  //Should be first statement after foreach.
                      {
                          Console.WriteLine(siteCollectionInner.Url);
                          //Exception occurs here.
                      }
                      finally
                      {
                          if(siteCollectionInner != null)
                          siteCollectionInner.Dispose();
                 }
             }
         }
     } // SPSite object siteCollectionOuter.Dispose() automatically called.
 }