how to check Starting Digit of Text box greater than 6

Accepted answer

Hi,

Use regular expression for validation -

function ValidateForm() {

var mobile = document.getElementById("txtMobileNumber").value;

var r = /^[789]\d{9}$/;

if (!r.test(mobile)){

alert('Invalid mobile number');

return false;

}

+1

Thank You !

I Did it with :

runat="server" ControlToValidate="txtMobileNo"
ErrorMessage="Number Start with 7,8 or 9" ValidationExpression="^[789]\d{9}$"
ValidationGroup="a">

0

Max size you can just manage with the MaxLength property, so that is simple.

To check if it begins with you have methods like BeginsWith. Or you have char array of the string, so for example:

if(txtMobileNumber.Text[0].IsNumber)

if(txtMobileNumber.Text[0] == '7' || txtMobileNumber.Text[0] == '8' ||txtMobileNumber.Text[0] == '9')

or something like that...hope that helps!

0