If you're trying to use curly brackets inside a String.Format expression...

int foo = 3;
string bar = "blind mice";
String.Format("{{i am in brackets!}} {0} {1}", foo, bar);
//outputs "{i am in brackets!} 3 blind mice"

If you're trying to use curly brackets inside a String.Format expression...

int foo = 3;
string bar = "blind mice";
String.Format("{{I am in brackets!}} {0} {1}", foo, bar);
//Outputs "{I am in brackets!} 3 blind mice"

If you're trying to use brackets inside a String.Format expression...

int foo = 3;
string bar = "blind mice";
String.Format("{{i am in brackets!}} {0} {1}", foo, bar);
//outputs "{i am in brackets!} 3 blind mice"

If you're trying to use curly brackets inside a String.Format expression...

int foo = 3;
string bar = "blind mice";
String.Format("{{i am in brackets!}} {0} {1}", foo, bar);
//outputs "{i am in brackets!} 3 blind mice"