How to access the variables form one function to another function in GUI?????

Hai, Kindly help me to solve this issue,Hereby my code is,

function PFM Callback .........

[filename pathname] = uigetfile({'*.txt'},'FILESELCTOR',Multiselect','on')

aa = {'applecongig.txt';'nokiadata.txt'}

if isequal(filename(1),aa(1))&& isequal(filename(2),aa(2))

fullpathname1 = strcat(pathname,filename(1))

fullpathname1 = strcat(pathname,filename(2))

set(handles.text1,'string',fullpathname1)

handles.fullpathname1 = fullpathname1

set(handles.text2,'string',fullpathname2)

handles.fullpathname2 = fullpathname2;

guidata(hObject,handles)

function validate ..........

filename1 = handles.fullpathname1

filename2 = handles.fullpathname2

[y] = check_check[filename1,filename2] 

%%%%%%%%%%% I need to access the fullpathname1,fullpathname2 which I used in first function,so that I can this function ([y] = check_check[filename1,filename2])