how to do an if statement in c#

if (/*condition here*/)
{
	//code here
}

string emotions;
emotions = Console.ReadLine();
//for emotions say the user input was either
//happy,sad and mad
if (emotions == "happy")
{
  Console.Write("You are happy");
}
else if (emotions == "sad")
{
    Console.Write("You are sad");
}
else if (emotions == "mad")
{
    Console.Write("You are mad");
}
else
{
    Console.Write("Unknown input");
}

if (condition)
{
  // block of code to be executed if the condition is True
} 
else if
{
  // block of code to be executed if the condition is True
}
else
{
  // block of code to be executed if none of the other conditions are True 
}