Ditto on the other posts.
But if you do not have a license to carry in IL, you also cannot carry "on your person" in TX. You can have a firearm in your car. But not your pocket.
“A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.” ~George Washington
US Coast Guard 76-86 Semper Paratus