how to manipulate the binary numbers in c sharp ?

Right shift: >>
Left Shift:  <<
AND:         &
OR:          |
XOR:         ^

A very simple Google would have found you this. See MSDN Operators[^]

In future, please try to do at least basic research yourself, and not waste your time or ours.



"May i know how to declare this binary num also"

All numbers are binary numbers in the final analysis - all of the above work fine on byte, int and long datatypes.
If yopu are trying to specify a number in binary in your C# code, then you can't: the C# language specification only allows Decimal and Hexadecimal numbers. Hex is the normal way to enter them:

int i = 0x5F;

if the equivalent of

int i = 95;

or (if it worked in C#, which it doesn't)

int i = 0b1011111;