Create the program below using C# only. Please show the output.

Assessment and Activities: Arithmetic X Create a form allowing you to add, subtract, divide and multiply numbers: Choose first number Choose second number Arithmetic Checce first number 12 Choose second Humber Having created your window, first attach code to the buttons so that if you leave one of the numbers blank (or enter an invalid number) you get an error message: Error You haven't entered a valid number in the text box OK Anmetic Choose first men Choose second number 1 If, on the other hand, you enter valid numbers, you should see the answer appear in a label at the bottom of the window (set its Visibility property in XAML to Collapsed, then set it to Visiibility. Visible in code): The answer is 1.86