How to deactivate feature from site collecion programmatically?

Question

How to deactivate feature from site collection? I am trying the code below but got this error:

Updates are currently disallowed on GET requests.  To allow updates on
  a GET, set the 'AllowUnsafeUpdates' property on SPWeb".

private void DeactivateProvisioningFeature()
        {
            using (SPSite site = new SPSite(SPContext.Current.Site.Url))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    web.AllowUnsafeUpdates = true;
                    site.AllowUnsafeUpdates = true;

var feature = site.Features.SingleOrDefault(sf => sf.DefinitionId == new Guid("464b78de-c14e-4c88-bd52-00136fc899f4")); // find delegate control provisioning feature
                    if (feature != null) //if feature is activated
                    {
                        site.Features.Remove(feature.DefinitionId, true); //deactivate feature
                    }

web.Update();

site.AllowUnsafeUpdates = false;
                    web.AllowUnsafeUpdates = false;
                }
            }
        }

ECM4D · Answer

You do NOT need and you should NOT call web.update(). This mean that you save this property to the database.

To disable site collection feature, you do not need SPWeb instance also.

If you have permissions to manage features of the site, you also do not need new SPSite object instance.

Try to write you code like, this:

if (SPContext.Current.Site != null)
{
    site = SPContext.Current.Site;
    site.AllowUnsafeUpdates = true;

//YOUR FEATURE DEACTIVATION CODE

site.AllowUnsafeUpdates = false;
}

How to deactivate feature from site collecion programmatically?

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