How to use ternary operator in C#

int five = 5;
string answer = five == 5 ? "true" : "false";

I see that you want to use this to write the values out in ASP.NET, the answer string will hold your desired value, use that as you please.

The ternary operator in just about every language works as an inline if statement:

Console.WriteLine((five == 5) ? 'true' : 'false');

(You shouldn't strictly need the inner parens, but I like to include them for clarity.)

If the boolean evaluates to true, then the entire expression is equal to the value between the ? and :. If the boolean evaluates to false, the expression equals the value after the :.

I don't believe you can include lines of code in the middle of the operator. These are simply supposed to be expressions that replace the entire operator "phrase" once the condition is evaluated.

I'm a Java guy and don't really know C#; maybe it's different. But probably not.

You could keep it really simple. Comparing five to 5 results in a boolean, so the following is also possible:

int five = 5;
Console.WriteLine((five == 5).ToString());

The bool type's ToString() method is already designed to return "True" or "False", and if the lowercase alternative is needed, thats simple too:

int five = 5;
Console.WriteLine((five == 5).ToString().ToLower());

If you don't need it lowercased, you can actually completely eliminate the ToString as well:

int five = 5;
Console.WriteLine(five == 5);