Member Avatar for techlawsam 
total += nValue;

so would that mean that whatever the total is it will be added towards nValue, or is something being incremented?

Thanks

Edited by happygeek because: fixed formatting
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asked whether the += form means "add the left side to the right" — captured the intent: it updates the left-hand target by adding the right-hand value. 's note about other compound forms is useful, but a few extra details are often missed and can change behavior in real code.

The language makes E1 op= E2 convenient but not identical in all respects to writing the longer form. In C# the left-hand operand is evaluated only once (important for properties, indexers or expressions with side effects). The operation uses any applicable user-defined + overload, and the result is implicitly converted back to the left-hand type when needed. See the official notes on compound assignment for precise rules: .

A small example shows the single-evaluation effect:

class Foo {
  private int _v;
  public int Value {
    get { Console.WriteLine("get"); return _v; }
    set { Console.WriteLine("set"); _v = value; }
  }
}
var f = new Foo();
f.Value += 2;

This will call the getter once and the setter once.

Additional cautions: += on delegate/event types performs subscription (not numeric addition). Integral arithmetic and conversions obey checked/unchecked contexts (overflow behavior can change) — see checked keyword. Compound assignment is not atomic for shared counters; prefer atomic APIs such as Interlocked.Increment for thread-safe increments. For operator overloading details, consult operator overloading.

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Member Avatar for catherine sea

It means

total = total + nValue;
Member Avatar for jnmisa 
Also you can have
total = total * nValue // total *= nValue
total = total / nValue  // total /= nValue
total = total - nValue  // toatl -= nValue
Some time you can Also have something like thing 
total *= 0.05M; // total = total * 0.05, Note the present of M.
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