Use the out keyword to let a method return multiple values

First, a function is defined as follows:
Public bool checkuser (string username, out string password, out int state)
{
If (username = "123 ")
{
Password = "456 ";
State = 0;
}
Else
{
Password = "";
State = 1;
}
Return false;
}
The application method is as follows:
String Password = "";
Int state = 0;
String username = "ABC ";
Bool falg = checkuser (username, out password, out State );
The three values returned by the function checkuser are falg, password, and state.
When using out parameters, you must declare them in advance. Otherwise, they cannot be used and can be considered as initialization of output parameters.
There are two methods: 1. use Pointer variables to declare functions (or use array variables) 2. the first method to use outgoing parameters: the function returns a pointer address (array address), which stores multiple variables. I am not very familiar with this method. I am often confused when passing values through addresses. Method 2: use an example. First, a function is defined as public bool checkuser (string username, out string password, out int state) {If (username = "123") {Password = "456 "; state = 0;} else {Password = ""; State = 1;} return false;} the application method is as follows: String Password = ""; int state = 0; string username = "ABC"; bool falg = checkuser (username, out password, out State ); the three values falg, password, and state returned by the function checkuser must be declared in advance when the out parameter is used. Otherwise, they cannot be used. Initialize the output parameters.