How to do Arduino serial communication with MATLAB GUI Push button?

This is the code which is available in Matlab central

s=serial('COM','BAUD', 9600);

fopen(s);

for m=1:10

servalue= input('Enter the value 100 to turn ON LED & 101 to turn OFF LED :');

fprintf(s,servalue);

end

*I want to use it with push button in GUI

This is My code:*

function pushbutton1_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global a

s=serial('COM40','BAUD', 9600);

fopen(s);

function pushbutton2_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton2 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global a

servervalue= 100;

fprintf('%d\n',servervalue);

% --- Executes on button press in pushbutton3.

function pushbutton3_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton3 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global a

servervalue= 101;

fprintf('%d\n',servervalue);

Code for Arduino

const int ledpin=13;

int recValue;

void setup() { Serial.begin(9600); pinMode(13, OUTPUT); }

void loop()

{

if(Serial.available()>0)

{

    recValue=Serial.read();

    if  (recValue == 100)     

     { 

       digitalWrite(ledpin, HIGH);

       }

        if(recValue == 101)    

         { 

         digitalWrite(ledpin, LOW);

         }
      }
    }

it print the value 100 when i press button2 and print value 101 when i press button3 but there is no response in LED?

Any one please help me to do so ........