In programming, we need data type that can have only one of the following values:
YES/NO, ON/OFF, TRUE/FALSE
For this , C# has a bool data type, which can take the values true or false. A Boolean type is declared with the bool keyword.
bool isColdWeather = true;
bool isWarm = false;
Console.WriteLine( isColdWeather);// Outputs True
Console.WriteLine( isWarm);// Outputs False
A Boolean expression is a C# expression that returns a Boolean value: True or False.
We can use the comparison operator, such as greater than(>) operator to find out if an expression ( or a variable) is true:
int x = 9;
int y = 8;
Console.WriteLine(x > y); // returns True, because 9 is greater than 8
Console.WriteLine(9 > 8); // returns True, because 9 is greater than 8
Boolean value mustly use to checking it's current state and then reacting to it. For example using if statement like as given below.
bool isChecked= true;
//or also you can use if statment as given below
//if (isAdult == true)
Console.WriteLine("This is not Checked");
It's not very often that you will find the need to convert a boolean into another type using Convert.ToBoolean, because it's so simple. We need to convert between an integer and a boolean because booleans are sometimes represented as either 0 (false) or 1 (true).
int intVal= 1;
bool isChecked = Convert.ToBoolean(intVal);
Console.WriteLine("Bool: " + isChecked.ToString());
Console.WriteLine("Int: " + Convert.ToInt32(isChecked).ToString());