Mobile number textbox validation

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using System.Text.RegularExpressions;

Regex re = new Regex("^9[0-9]{9}");
if (re.IsMatch(txtMob.Text.Trim()) == false || txtMob.Text.Length > 10)
{
  MessageBox.Show("Invalid  Mobile Number !!");
  txtMob.Focus();
}

I have implemented the above code and it displays invalid mobile number for any given number.

I would like to implement validations, which would show a "Characters are not allowed" message when any characters are typed and show an invalid number message when more than 10 digits are entered.

Please help me out!

Posted 29-Jun-11 6:44am

rbnsubedi

Updated 11-Jun-18 0:17am

Tarakeshwar Reddy

v3

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2 solutions

Solution 2

I wouldn't do it by using keypresses in a TextBox. How I do my validations is to accept a free-typed phone number, then go a strip all non-numeric characters from the input, validate the number for the country in question, the reformat the number as a string according to the rules for that country.

That allows used to type numbers in in anyn format they chose and I still get the data I want without frustrating the customer.

By the way, youre regex pattern demands that every number typed in be 10 digits long and always start with a 9.

Posted 29-Jun-11 14:11pm

Dave Kreskowiak

Updated 29-Jun-11 14:13pm

v2

Comments

Sergey Alexandrovich Kryukov 30-Jun-11 19:19pm

I must say I disagree if you voted 1 for the answer by Rajesh. Validation could be used on top of filtering by KeyPressed. If the filtering is simple, it should always be used. If it is complex (for example, position-dependent as some try to design), it could confuse the used and should never be used.
--SA

Dave Kreskowiak 30-Jun-11 21:30pm

Filtering is almost never simple. There's always going to be that next "requirement" that screws up what you've already done.

Sergey Alexandrovich Kryukov 3-Jul-11 1:13am

Maybe, but I mean this particular case and some similar ones: filter out all but digits and backspace (may be one or two more). This is used all the time and not confusing at all.
--SA

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Rajesh Lagaria · Accepted Answer · 2011-06-29T06:57:00

on TextBox KeyPress event write this code :

C#

private void txy_Keypress(object sender, KeyPressEventArgs e)
        {
            if (!char.IsNumber(e.KeyChar) & (Keys)e.KeyChar != Keys.Back & (Keys)e.KeyChar != Keys.Enter)
            {

                e.Handled = true;
            }

            base.OnKeyPress(e);
        }

and on TextChanged event write this code :

C#

if (txtMob.Text.Length > 10)
{

MessageBox.Show("Invalid Mobile Number !!");

txtMob.Focus();
}

or set text Maxlenth proparty set 10

hope this help