can any body help me for creating hangman in c#.

Then it is easy if you are getting "word to find" from a hard coded string array.
1. You take the random word from your string array.
2. Add 26 buttons for taking input letters (A,B,C.. etc)
3. When any input button is pressed, store that letter into a "temp" string.
4. Convert the "Word to find" string into character array.
5. Make another string "stringToDisplay" which you have to display on GUI for intermediate status
(For example: If Word is "APPLE" then at some point of time, your stringToDisplay could be as  "A_PL_" )
6. Check each letter in the "WordToFind" character array whether any letter is matched with input letter.

7. Wherever we find any match, we keep appending that letter into "stringToDisplay".
8. wherever we don't find match, we append "_" into stringToDisplay. In addition to this, whenever computer finds a wrong attempt (guess) by a player, Computer draws a small portion of the HANGMAN

9. Display every time "stringToDisplay" on a label on the GUI for the player to view his current progress.

10. Let the player keep guessing until computer completes its HANGMAN drawing or player guesses all the letters in the word correctly.

Hope the above logic works for you.
Please mark it accepted answer if you find this suggestion is good for you.

A similar type of Word guessing game I made it earlier that is posted on my blog:
http://hemant-srivastava.blogspot.com/2012/11/hangman-game-guess-word-in-c.html

Thanks
Hemant