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TextBox Validation windows Forms Applications C#

praveen kumar

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

2 Replies

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Sujeet Suman11y ago
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.
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Shashank Patil11y ago

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;

-------------------------------

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