i need a textbox and button
in textbox i have to keep validation in windows form
in text box 1st letter should start with 3
and 2nd letter should start with R||c
I MEAN R OR C
3rd and 4th should be OF||OH||OD
5TH LETTER SHOULD BE B or 0-9
and 6th to 12th it should be a numbers
only
total it should not exceed 12words in textbox