Hi,
It seems that the location is not fitting on the screen or is hidden by another control right on that location, or the project did not build clean (without error). I would follow the below steps to solve this problem:
1- Put a breakpoint and trace the code behind the form step-by-step and make sure it runs without any error or exception
2- Change the location to 0,0 in order to make sure that the display has enough place to present the button then re-arrange the location based on your own wish
3- Make sure the control is not seating under another control, there are several ways to check this, one is to remove all other controls, another is to use the
BringToFront method.
Cheers,
Aydin