Progess bar before opening windows application

Hi ,

 

 

I am windows application , after clicking on exe it takes 15 sec to open (coz of the looping in database query,  400 records) . how to show the progress bar till it pull all the data from database 

1) After clicking on exe

2) progress bar should be visible  till my datagridview fill

3) progress bar should get dispose once datagridview is visible

 

please help me with proper code