Static Text update according to GUI List box callback

I am trying to update my static text with tag text105 on my gui according to the value selected from the list box. The code I have developed is below, but it failed to display the value. Kindly spot the error.

function listbox1_Callback(hObject, eventdata, handles)
a=get(handles.listbox1,'value')
if (a==Natural-Gas)
    Cv=12500;
    set(handles.text105,'string',Cv)
    drawnow;
elseif (a==Propane-Butane)
    Cv=11950;
    set(handles.text105,'string',Cv)
    drawnow;
elseif (a==Fuel-Oil)
    Cv=9520;
    set(handles.text105,'string',Cv)
    drawnow;
elseif (a==Diesel)
    Cv=1000;
    set(handles.text105,'string',Cv)
    drawnow;
elseif (a==Brown-Coal)
    Cv=3500;
    set(handles.text105,'string',Cv)
    drawnow;
elseif (a==Woods)
    Cv=2500;
    set(handles.text105,'string',Cv)
    drawnow;
elseif (a==Electricity)
    Cv=860;
    set(handles.text105,'string',Cv)
    drawnow;
end

Answer 1

[BhaTTa]

Hey @Muhammad Salman Arif, You’re comparing the index (a) to literal strings like Natural-Gas, which is incorrect. The Value property returns an integer (the selection index), not the string itself. Also, you're using unquoted identifiers like Natural-Gas, which is incorrect