Windows Forms visual studio question help!

Question 3 (6 marks) Add a textbox and button to the above form to test whether a string entered into the textbox is a palindrome. A palindrome is a number that is the same forward as it is when reversed. The number must be less than 10 digits greater than 2 digits and not negative. Validation is required. The number 19391 is a palindrome and 23453 is not ... 33, 1234554321 and 3A3 are invalid