doubt in c#

Question

Please mention how and when to use place holder {0} or {1} etc
with method WriteLine().

Answer 1

When you want to replace a value in the output...
For ex:
int marks=80;
String name="ABC" ;

Console.WriteLine("{0} - {1}", name, marks) ;
Output:
Abc - 80

Its just like same, taken of c printf syntax...