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To solve problem you need to create httpcontext constructor explicitly like below code

public class MyEventHandler: SPItemEventReceiver
{
HttpContext current;
public MyEventHandler()
{
current = HttpContext.Current;
}


public override void ItemAdding(SPItemEventProperties properties)
{

//perform validation if required.

// get the list which item to be added
SPSite objsite = new SPSite (properties.SiteId);
SPWeb objweb = objsite.OpenWeb (properties.RelativeWebUrl);
SPList objlist = objweb.Lists[properties.ListId];

//use this method to disable reoccurence of events.

DisableEventFiring();
SPListItem itemToAdd = objlist.Items.Add();

//add item to list

itemToAdd.Update();
EnableEventFiring();

// provision sub site and perform required action

//redirect it to your new destination like newly provisioned sub site or any other page you want.

SPUtility.Redirect(strNewresiractionUrl, SPRedirectFlags.Trusted,current);

}

Posted by Vaibhav Jain (Success is always one step ahead)