Convert string to ascii values

Question

Hello !
                iam subhakar...in windows application, i am creating one interface like two textboxs,one button.enter a string in first textbox when i click the button it display the ascii value in second textbox.but it did't get correct out put,i get a error "u do't convert string to int values".tell me correct soluation for this problem....
                                can anybody help me please..........