Limit TextBox entry

Limit TextBox entry

• Yannis26

  You should have a look at the MaskedTextBox class where you can define a mask to be all numeric with the Mask property.

  
  
  

• Glenn Burnside

  The simplest way to limit the input type, is to validate the input befour it is even shown, here I use: OnKeyPress

  Here is a one method to do it, there might be some simpler way out there:

  this.MyTextBox += new KeyPressEventHandler(OnlyNumbers);

  
  void OnlyNumbers(object sender, KeyPressEventArgs e)
  {
  if (Convert.ToInt32('0') <= Convert.ToInt32(e.KeyChar) && Convert.ToInt32(e.KeyChar) <= Convert.ToInt32('9'))
  e.Handled = false; //Allow
  else
  e.Handled = true; //Not allow
  }

  You would ofcourse have to add: backspace and so on.

  Like I said, I think there are more simpler way out there, like the above user seaid, use Masked TextBox :)

  
  
  

• GimGif

  Hi

  I don't think there is a textBox to perfom what you what. The way I do it is to have a class that is going to validate all your textBoxes have a looksie at this class.

• hotmailman

  Hi again

  this is little snippet that validates during the user input

• Ahmed abd el hakim

  hi,

  you can use keypress event handler to achive that

  public partial class Form1 : Form { public Form1() { InitializeComponent(); //event handlers this.textBox1.Leave += new System.EventHandler(this.textBox1_Leave); this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox1_KeyPress); } private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { //this to validate during data entry if (!char.IsNumber(e.KeyChar) && e.KeyChar != '.') { MessageBox.Show("plz enter numbers only"); e.Handled = true; } } private void textBox1_Leave(object sender, EventArgs e) { //this to validate during user right click the textbox and hit past double value; bool result = double.TryParse(textBox1.Text,out value); if (!result) { MessageBox.Show("this is not numeric \n plz insert numeric value"); textBox1.Focus(); } } }

  hope this helps

  
  
  

• Eze..

  Perfect. Thanks.
  
  
• Limit TextBox entry