regards validation in phone number

Indra Kumar S

Hi i am using following code for phone number validations, after 10 digits it will display error message "Please enter only 10 digits" but after 10 digits if we enter number means it will add number so please help me this textbox must not add number after 10 digits.

private void txtcontactno_TextChanged(object sender, EventArgs e)

{

if (System.Text.RegularExpressions.Regex.IsMatch(txtcontactno.Text,@"^([0-9]{1,10})$"))

{

//MessageBox.Show("match pattern");

// Do something here

}

else

{

MessageBox.Show("Please enter only 10 digits");

txtcontactno.Focus();

}

5 Replies

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Vipul Malhotra11y ago
Hi Indra, As per my understanding, you want to restrict that the no. of integers that can be entered in the textbox should not be more than 10. Now, as you have mentioned that you are using C#, then i would suggest you to use the inbuild feature of ASP.NET TextBox. Just append this property to it: MaxLength="10" In this way, you would not be able to enter anything beyond 10 integers/alphabets. Please mark this post as answer if it helped. Thanks Vipul
+1
Raja T11y ago
Hi, Try like this
Regex re = new Regex("^9[0-9]{9}");
if(re.IsMatch(txtPhone.Text.Trim()) == false || txtPhone.Text.Length>10) {
MessageBox.Show("Invalid Indian Mobile Number!!");
txtPhone.Focus();
}
If you want more details checkout bellow urls

http://stackoverflow.com/questions/9513488/validating-indian-phonenumber-in-windows-form-application-using-net-c

http://stackoverflow.com/questions/9596925/regular-expression-for-indian-phone-number

http://www.codeproject.com/Articles/13922/Validate-user-input-in-Windows-Forms
0
Amitesh Verma11y ago
http://www.dotnetspider.com/resources/37635-How-Validate-Indian-Phone-Number.aspx

http://www.c-sharpcorner.com/Forums/Thread/65719/how-to-validate-indian-mobile-numbers-using-regular-expr.aspx
0
Indra Kumar S11y ago
Hi amitesh
but i am in c#.
0
Amitesh Verma11y ago
use javascript instead:
function phonenumber(inputtxt)
{
var phoneno = /^$?([0-9]{3})$?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;
if((inputtxt.value.match(phoneno))
{
return true;
}
else
{
alert("message");
return false;
}
http://www.w3resource.com/javascript/form/phone-no-validation.php
0