.= operator, for calling a method or property and assigning the result back to the left-hand variable

[ekolis]

For instance:

string info = "this is a secret string";
info.=Replace("secret", "redacted");

would be shorthand for:

string info = "this is a secret string";
info = info.Replace("secret", "redacted");

And this could also be used with properties, but of course the return type of the method or property would have to be assignable to the type of the variable on the left-hand side.

[HaloFour]

See: #3051