Cancel the beep and an error msg in GUI button cancellation

I created a save2XLS button in GUI that contain the following code:

[filename,pathname]= uiputfile('*.xls','Save as');
column=get(handles.foTable,'columnname')' ;
dataX=get(handles.foTable,'data');
num=[column;dataX];

fullFileName = [pathname filename]
if exist(fullFileName)
    %overwrite the file
    delete([pathname filename])
    xlswrite([pathname filename],num);
else
    %write new file
    xlswrite([pathname filename],num);
end

If I decide to cancel the "save as" operation by clicking the X or the cancel button I get a beep and an error in the command window. How can I cancel it?

Thanks

Answer 1

[Image Analyst]

Bail out if they click cancel

if filename == 0
  return;
end

[dan kin]

thanks