Validation For A Textbox

Question

Hi ,

Need a validation code for a textbox in windows form, that allow me to enter the values like

1

11

1.3

1.33

11.33

I am using this text box for entering tax values .

this textbox should allow only two digits before and after decimal point .

Thanks in advance :)

waqas memon · Answer

hi ramesh try this link http://codingresolved.com/discussion/41/how-to-restrict-textbox-to-numbertextbox-numbers-onlytextbox-just-numbers/p1

Iftikar Hussain · Answer

here it is this.textBox1.KeyPress += new KeyPressEventHandler(this.textBox1_KeyPress); private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { var text = textBox1.Text.Trim(); if (Regex.IsMatch(text, @"^\d{1,2}(\.\d{1,2})?$")) { // Do something here } else { MessageBox.Show("Doesn't match pattern"); } } Regards, Iftikar

Ramesh Ushodaya · Answer

Its working good . Thank you so much :)

Iftikar Hussain · Answer

you can use MaskTextBox set the mask as 00.00 Regards, Iftikar

Ramesh Ushodaya · Answer

Its not working sir, I need this validation when Keypress. It should work like this User can allow to enter upto two digits before and after the decimal point. if user enter two digits it should not allow for the third digit but it can allow ".". if user enter "." it should allow only two digits after ".". like 2, 22, 2.3, 2.33, .3, .33, 2.33, 22.33 A Big Thanks for the replies :) . But need a Perfect solution :( .

Ramesh Ushodaya · Answer

Thanks for the reply , I need this validation when key press . Is it possible ?

Iftikar Hussain · Answer

Hi, Try like this you need to do this after entering the data in textbox this.textBox2.Leave += new System.EventHandler(this.textBox1_TextLeave); private void textBox1_TextLeave(object sender, EventArgs e) { var text = textBox1.Text.Trim(); if (Regex.IsMatch(text, @"^\d{1,2}(\.\d{1,2})?$")) { // Do something here } else { MessageBox.Show("Doesn't match pattern"); } } Regards, Iftikar

Pankaj Pandey · Answer

hii create a function in which split the textbox data by ".". var x=txtbox.text.Split("."); string y=x[0].tostring(); string z=x[1].tostring(); now check that if x.lenght>2 or y.length>2 then raise validation.

Validation For A Textbox

Answers (8)