using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint; namespace DisableEventFiring
{
public classEventFiring : SPItemEventReceiver
{
public void DisableHandleEventFiring()
{
this.EventFiringEnabled =false;
} public void EnableHandleEventFiring()
{
this.EventFiringEnabled =true;
}
}
} //sample to use:
using (SPSite site = new SPSite("https://serverName/sites/Vijai/"))
{
using (SPWeb web = site.OpenWeb())
{
SPList list = web.Lists.TryGetList("Custom");
SPListItem item = list.GetItemById(34);
item["Title"] ="Updated Successfully";
EventFiring eventFiring = newEventFiring();
eventFiring.DisableHandleEventFiring();
item.Update();
eventFiring.EnableHandleEventFiring();
Console.WriteLine("Updated Successfully");
Console.ReadLine();
}
}

ref: http://www.c-sharpcorner.com/UploadFile/anavijai/programmatically-disable-event-firing-on-list-item-update-in/

05-11 01:43