Introduction

It’s very important to dispose our objects in SharePoint to avoid Memory Leaks, this article will explain dispose Patterns or methods in SharePoint code.

Method 1 - Manually calling Dispose()

The most general and simple approach to dispose your objects is to simply call the .Dispose() method of your objects:
  1. SPSite site = new SPSite ("http://laxman-sharepoi:1000/admin/");
  3. // Do stuff
  5. site.Dispose();
Method 2 - Encapsulating the statement in a using() block

A more common approach is to encapsulate the code in a using-block where the object will be automatically disposed when we are reaching the end of our block.
  1. using (SPSite site = new SPSite ("http://laxman-sharepoi:1000/admin/"));
  3. {
  5. // Do stuff
  7. }
Method 3 - Utilize a try/finally block

Whenever you are expecting to catch an exception and need to handle them – a better approach for disposing is to create a try-finally block and dispose the object in the finally-block.

Sample 1: Without exception handling.
  1. SPSite site = null ;
  3. try
  5. {
  7. site = new SPSite ("http://laxman-sharepoi:1000/admin/");
  9. // do stuff
  11. }
  13. finally
  15. {
  17. if (site!=null ) site.Dispose();
  19. }
Sample 2: With exception handling.
  1. SPSite site = null ;
  3. try
  5. {
  7. site = new SPSite ("http://laxman-sharepoi:1000/admin/");
  9. // do stuff
  11. }
  13. catch (Exception ex)
  15. {
  17. // Handle the exception
  19. // Possibly genrate logs
  21. }
  23. finally
  25. {
  27. if (site!=null ) site.Dispose();
  29. }
Method 4 - A mix mode approach

In some scenarios it might be a necessity to use mix oapproach for disposing.
  1. using (SPSite site = new SPSite ("http://laxman-sharepoi:1000/admin/"))
  3. {
  5. foreach (SPSite site in site.WebApplication.Sites)
  7. {
  9. try
  11. {
  13. // Do stuff
  15. }
  17. catch (Exception ex)
  19. {
  21. // Log and handle exceptions
  23. }
  25. finally
  27. {
  29. if (site!=null ) site.Dispose();
  31. }
  33. }
  35. }