c# - Expanders in WPF -

i new wpf , working on projects our ui. quote problem 1.) have openfiledialog box in user can select dll or text files. 2.) if select dll fine , user operates in normal way, if user selects text files have processing on text files. 3.) there few steps on text file around 4-5 steps. after steps convert specfic file , user proceeds in normal way.

what have done when user selects text files openfiledialog processing , show in expander status image, labels (this label contains command executed),etc.

but problem expander shows after every process completes, not show real time how ti changes. started coding in wpf learning stuff , dont show how bring step step , how update ui when corresponding valeus changes in processing.

snippet of code:

browser_button() {     if ( button == ok )     see if text or dll    if dll       continue    if text files      processing 4-5 steps      expander contains processing logic give result of each stage.  }  expander_expander(object,event) {  } 

the problem me expander steps come after processing completed. can me in finding solution. totally new wpf learning stuff.