Docs

docs/FAQ.md

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+### I occasionally get a NullReferenceException, what's wrong?
+You probably don't check the result status of a call and just assume the data is always there. `NullReferenceExecption`s will happen when you have code like this `var symbol = client.GetTickersAync().Result.Data.Symbol` because the `Data` property is null when the call fails. Instead check if the call is successful like this:
+````C#
+var tickerResult = await client.GetTickersAync();
+if(!tickerResult.Success)
+{
+  // Handle error
+}
+else
+{
+  // Handle result, it is now safe to access the Data property
+  var symbol = tickerResult.Data.Symbol;
+}
+````
+
+### The socket client stops sending updates after a little while
+You probably didn't keep a reference to the socket client and it got disposed.
+Instead of subscribing like this:
+````C#
+private void SomeMethod()
+{
+  var socketClient = new BinanceSocketClient();
+  socketClient.Spot.SubscribeToOrderBookUpdates("BTCUSDT", data => {
+	// Handle data
+  });
+}
+````
+Subscribe like this:
+````C#
+private BinanceSocketClient _socketClient = new BinanceSocketClient();
+
+// .. rest of the class
+
+private void SomeMethod()
+{
+  _socketClient.Spot.SubscribeToOrderBookUpdates("BTCUSDT", data => {
+	// Handle data
+  });
+}
+
+````