TextBox Validation windows Forms Applications C#

Question

Hi Every One my Validation is Rttk A12345 like this total length 11 characters First 4 letters common than 5th letter space 6 th letter will be Capital A to Captial Z any one of those remaining five characters is integer this is my requirement if any body knows please replay me . Thank you in Advance

Sujeet Suman · Answer

Praveen please try once below code: using System.Text.RegularExpressions; private void textBox1_Validating(object sender CancelEventArgs e) { if (!Regex.IsMatch(textBox1.Text @^Rttk [A-Z][0-9]{5}$)) { errorProvider1.SetError(textBox1 Invalid Text!); } else { errorProvider1.SetError(textBox1 null); } } If this is useful for you then please accept my Answer .

Shashank Patil · Answer

first 4 letters are common i.e Rttk Regex regex = new Regex( @^Rttk [A-Z][0-9]{5}$ ); Match match = regex. Match (  Rttk A12345  ); if(match.Success) { return true; } ------------------------------- If it helps you please accept my answer.