Check out example codes for "c# how to disable a event". It will help you in understanding the concepts better.

Code Example 1

object.Event -= new EventHandlerType(your_Method);
// Change your cell value
object.Event += new EventHandlerType(your_Method);

Code Example 2

bool dontRunHandler;

void Handler(object sender, EventArgs e) {
   if (dontRunHandler) return;

   // handler body...
}

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