need help regarding textbox...

haseeb saeed

hello... i have quite a good idea of java and C sharp... previously i worked in c++ and over there in order to make a string appear in the text box i had to program it manually that is i made a string. Same was the case in java, text in textboxes were shown by programing the event (keypressed or keyup) in the manner that it would form a string. but here in c sharp the textbox string is made automatically ie when i make the text box object i dont really need to attach an event to it to make strings.
My questions are:
1. is this handler already implemented in the textboxbase class? if not where is it implemented?
2. i want to change the handler? do i have to override any member or property? if yes plz provide the name of the member or property...

actually i want my text box to produce a beep when the first character is inserted as a number. also i want not to allow the special characters, though i want underscore to be implemented . please provide an insight

thanx...

3 Replies

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praveen kumar20y ago
u can also use regex to find numeric characters and special characters.
0
Craig Murphy20y ago
Hopefully the following code will set you off in the right direction. There are better ways of testing for 0-9, this works, you may wish to replace it with your own. The event that you need to pick up on is called TextChanged. For this to work, you need a form and a textbox (with the TextChange event as below).

private void textBox1_TextChanged(object sender, EventArgs e)

{

if (textBox1.Text.Length > 0)

{

    Char c = textBox1.Text[0];

    int n = System.Convert.ToInt16(c);

    // 0-9 test

    if ( (n>=48) & n<=57)

      Console.Beep();

}

}

HTH
0
Ajnavi Rani20y ago
you can use error provider control for the same.
0