I have a form created in Windows Forms which is draggable wherever I click. I made it by overriding WndProc function which in turn modifies each click as it was a title bar
In addition to JaredPar I would suggest don not create draggable form in that way, but handle it in 3 steps
It is not a complicated to handle, and it's better, imo, then disabling a double click on the form.
For complete example of how you can do that can have a look on
Creating a Draggable Borderless Form