Boolean data type is declared with the  keyword, bool. it would allow you to define either true or false.
using System;
//csc check_bool_1.cs
//my example
class check_bool
{
public string str;
}
class test
{
public static void Main()
{
//create object
check_bool cb= new check_bool();
//out put inside a command window
Console.WriteLine("Welcome to Hello world");
Console.Write("What is your name?: ");
//read input from the commandline
cb.str = Console.ReadLine();
Console.WriteLine("Hello: " + cb.str);
bool admin ;
if (cb.str=="manas")
{
admin= true;
Console.WriteLine( cb.str + " He is an admin: = " + admin);}
else {
admin= false;

Console.WriteLine( cb.str + " He is not an admin: = " + admin);}

}
}