Does disposing SPSite dispose the SPWeb automatically?

Question

Suppose we have code:

CASE 1:

using (SPSite site = new SPSite(SPContext.Current.Web.Url))
    {
        SPWeb web = site.RootWeb;
    } 

Do we need to dispose the SPWeb in this case?

CASE 2:

 using (SPSite site = new SPSite(SPContext.Current.Web.Url))
        {
            SPWeb web = new SPSite(SPContext.Current.Web.Url).OpenWeb();
        } 

Do we need to dispose the SPWeb in this case? Or does it get automatically disposed after the using block disposes the SPSite object?

Answer 1

In first case SPWeb web = site.RootWeb; SPWeb does not need to be disposed as SPWeb is retrieved from RootWeb. However, in second case SPWeb needs to be explicitly disposed. Mere disposal of SPSite is not enough. So the code should look like:

using (SPSite site = new SPSite(SPContext.Current.Web.Url))
{
    using (SPWeb web = site.OpenWeb())
    {

    }
} 

Note: there is no need to create an SPSite object again when opening SPweb as it is already present.

Answer 2

No, we need to dispose the SPWeb object separately. Because we are not assigning current SPWeb context to the web variable.

Here, 1. We are first getting the SPSite object from current context web url 2. Then we are retrieving the SPWeb object from SPSite 3. After that we are assigning that variable to the SPWeb.

So, we need to dispose the SPWeb object separately in Case 2 to clear the garbage memory. In Case 1: SPWeb object (web) is automiatically disposed by site.