Call from WPF user control to a method inside a windows form

Calling hosting page method from a user control is not a good approach, in that case you need to pass the form object to the user control. Instead of this you can define a delegate and event in the user control and register that event in the container form. In the event definition you can call the local method. You just need to raise the event from the WPF user control.

mharakeh1 wrote:

Can i call to the parent form whein the user control is in project and the form is in another project

It doesn't make any difference if the control is in same project or in a different project.