c# - How do I create a box for the user to enter their post code? -


i creating windows application in visual studio using c#.

i want create textbox user type post code. programme needs able verrify valid entry has been entered.

i new programming , have tried searching google got more confused.

this method have used validate british postcode... (note: validate using 3rd party api now)

        private bool ispostcode(string text)         {             var nospace = text.replace(" ", string.empty);             if (nospace.length < 6)             {                 return false;             }              char[] chars = text.tochararray();              if (chars[0] < 'a' || chars[0] > 'z')             {                 return false;             }              if (chars[1] < 'a' || chars[1] > 'z')             {                 return false;             }              if (chars[2] < '0' || chars[2] > '9')             {                 return false;             }              return true;         }

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