Question about |= in c#

Question

What means |= in c#?

Example:

int a= 0;
int b = a |= 5;

I can't find any hints for this.

Answer 1

the OR assignment operator.

full explanation is here. http://msdn.microsoft.com/en-us/library/h5f1zzaw(v=vs.71).aspx

Answer 2

|= is the OR assignment operator.

http://msdn.microsoft.com/en-us/library/h5f1zzaw.aspx