Insure Numeric Data in TextBox

[ronboy]

I have a windows form that has four input text boxes. The input for each of these must be integers. Is there a way (e.g. property) that I can set which will only allow the user to enter intergers??? Thanks for any help.

[Heath Stewart]

Extend the TextBox with your own class (like NumericTextBox, for example) and override either IsInputChar or IsInputKey). There are other ways involving overriding WndProc, but then you start getting into Windows notification messages which aren't necessary when the former two methods already encapsulate such functionality. If you don't want to extend the class (and it's usually a good idea to encapsulate your logic rather than handle each instance of it separately), you could handle the KeyDown event of each TextBox (they could use the same handler, though).

Microsoft MVP, Visual C# My Articles

[Huseyin Altindag]

Hi Ronboy, There is a way doing that.What you need to do is : -Fire a KeyPress event in properties for your TextBox this.textBox.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.textBox_KeyPress); private void textBox_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) { if (!Char.IsDigit(e.KeyChar) && e.KeyChar !=(char)8) e.Handled=true; } So you can enter now in the TextBox ONLY integers AND Backspace-key with (char)8 . e.KeyChar means it gets the char which is correspending to the key you pressed. e.Handled=true; means if you entered a non-integer value(0-9) you don´t pass this char to control element(TextBox). good coding Bye Huseyin Altindag Huseyin Altindag