Input Validate: How to accept only one or two digit integer?

Richard Vannoy

I'm programming a game. I want to accept only a one or two digit number.

Only digits 0-9 allowed.

Only 1 or 2 digits allowed.

When second digit entered, number is accepted. Program goes to range check (Message to user if number is odd or greater than 20)

For one digit number, user has to indicate done by pressing return.

Here is what I have:

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
char ch = e.KeyChar;
if (ch == 46 && textBox1.Text.IndexOf('.') != -1)
{
e.Handled = true;
return;
}
if (!char.IsDigit(ch) && ch != 8 && ch != 46)
// 8 = Backspace, 46 = decimal point
{
e.Handled = true; // Exits without taking any further action
}
}

3 Replies

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Rajeesh Menoth11y ago

Hi,

Try this..

 "Value1" Columns="2" MaxLength="2" Text="1" runat="server"/>

private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && (e.KeyChar != '.')) {             e.Handled = true; } // only allow one decimal point if ((e.KeyChar == '.') && ((sender as TextBox).Text.IndexOf('.') > -1)) {         e.Handled = true; } }

ref : http://stackoverflow.com/questions/463299/how-do-i-make-a-textbox-that-only-accepts-numbers

Prem Anandh J11y ago
-> Set TextBox max length to 2
->allow digit only in Textbox Keypress..
Try Following code. It May help you
private void Form1_Load()
{
TextBox1.Maxlength=2;
}
private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)

{

if (!(char.IsNumber(e.KeyChar)) && !(e.KeyChar == '\b'))

{

e.Handled = true;

}

else

{

e.Handled = false;

}

}
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Sumit Joshi11y ago
use regular expression RegEx class for the same

Refer link below
https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx
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