c# String Uppercase and Lowercase method

namespace string
{
class Program
{
static void Main(string[] args)
{
String a ="ram";
String b ="Lakshman";

String c ="Code";
String d ="Exampler";
Or

String a,b,c,d;
a ="ram";
b ="Lakshman";

c ="Code";
d ="Exampler";

Console.WriteLine(a+" "+b);
Console.WriteLine(c+" "+d);
}
}
}