How to allow only alphapets in a masked text box

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.NET3.5

Im using masked text in my form..I want to allow only alphabets in the masked textbox..i validated the text box for only allowing alphabets as the normal text box but it is allowing numbers..pls give the solution for it...

Posted 31-Jan-12 19:27pm

premkumar.r

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Christian Graus · Answer 1 · 2012-01-31T19:32:00

Solution 2

You're obviously not validating it properly. I tend to make my own control, because the masked text box just tells you when you entered something wrong, from memory. In the key press or key down event check Char.IsControl and Char.IsAlpha and if they both fail, reject the keypress.

Posted 31-Jan-12 19:32pm

Christian Graus

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premkumar.r 1-Feb-12 1:43am

private void txtSector_KeyPress(object sender, KeyPressEventArgs e)
{

txtSector.Mask = "AAA/AAA/AAA/AAA/AAA";
if (Char.IsLetter(e.KeyChar))
{
e.KeyChar = char.ToUpperInvariant(e.KeyChar);
}
Utilities.validateAlphabetsOnly(e);
txtSector.Text = txtSector.Text;
}

public static void validateAlphabetsOnly(KeyPressEventArgs e)
{
int ascii = Convert.ToInt16(e.KeyChar);
if ((ascii >= 97 && ascii <= 122) || (ascii >= 65 && ascii <= 90) || (ascii == 8))
{
e.Handled = false;
}
else
{
e.Handled = true;
}
}

we have validated correctly sir using the above events..we have put the validation for not allowing special characters and numbers..It is not allowing special characters but it is allowing numbers..Pls give any solutions..

Sergey Alexandrovich Kryukov 1-Feb-12 1:51am

I agree with this approach. It's the best, but only for simple criteria (filtering out some characters is simple).
My 5.
--SA

Abhinav S · Answer 2 · 2012-01-31T19:32:00

Solution 1

Use the Validating event[^] or KeyDown event and then write a simple regular expression to accept only alphabets.

Check this answer[^] out.

Posted 31-Jan-12 19:32pm

Abhinav S

v2