int a, b, c;
            a=Console.Read();
            b = Console.Read();
            c = a + b;
            Console.Write(c);

what is there wrong?

int[] nums=Console.ReadLine().Split(new char[]{'\n','\t',' '}, StringSplitOptions.RemoveEmptyEntries).Select(s=> int.Parse(s)).ToArray();
Console.WriteLine(nums[0]+nums[1]);

go and learn C#

Edited by author 01.09.2010 19:13

Is not any easier way?

Edited by author 02.09.2010 17:33

Edited by author 02.09.2010 17:33

Паскаль рулит :)

I highly recommend you to read some C# tutorials.
Here is a good start:
http://msdn.microsoft.com/en-us/library/67ef8sbd.aspx

PS: Console.Read can only read the next character from input stream.See more information at:
http://msdn.microsoft.com/en-us/library/system.console.read.aspx

There is a short way of writing that:

String[] s;
s = Console.ReadLine().Split();
Console.WriteLine(int.Parse(s[0])+int.Parse(s[1]));