query: In c# , what does it mean '??'?
positive_passages.docid: 87305
positive_passages.text: What do two question marks together mean in C#?
negative_passages.docid: 62520
negative_passages.text: What does the tilde before a function name mean in C#?
negative_passages.docid: 33398
negative_passages.text: C# difference between == and Equals()
negative_passages.docid: 96940
negative_passages.text: C# - | and & operators?
negative_passages.docid: 47477
negative_passages.text: What is "!!" in C?
negative_passages.docid: 22352
negative_passages.text: ? (Definition) versus ?? (Information)
negative_passages.docid: 131658
negative_passages.text: What is ?: in PHP 5.3?
negative_passages.docid: 111595
negative_passages.text: What does this sign exactly mean? |=
negative_passages.docid: 105748
negative_passages.text: What is "..." in switch-case in C code
negative_passages.docid: 70705
negative_passages.text: What does `!!~` mean in javascript?
negative_passages.docid: 50416
negative_passages.text: What does the >?= operator mean?
negative_passages.docid: 98343
negative_passages.text: What does '?' do in a Css link?
negative_passages.docid: 66172
negative_passages.text: What's the difference between  and ,  and ?
negative_passages.docid: 21907
negative_passages.text: Why is "\?" an escape sequence in C/C++?
negative_passages.docid: 99447
negative_passages.text: What is the difference between String? and String! (two ways of creating an optional variable)?
negative_passages.docid: 125608
negative_passages.text: what is [] brackets in .net?
negative_passages.docid: 96006
negative_passages.text: What does the ??!??! operator do in C?