7 Digit numeric or null Validation for TextBox in ASP.Net

Hi KALEEM,

Are you using any validator or javascript ?

Also do you want this validation on button click ?

Hi dharmendr

it's new copy of form there is no other validation .

I want a fresh code. please do help me.

Refer the below code.

HTML

<asp:TextBox runat="server" ID="txtmail" type="enroll" value="" placeholder="enroll"></asp:TextBox>
<asp:Button runat="server" ID="btnsubmit" type="submit" Text="Submit" value="Submit"
    OnClick="Validate" />

Code

protected void Validate(object sender, EventArgs e)
{
    string valueToValidate = txtmail.Text.Trim();
    bool SevenDigitNumber = Regex.IsMatch(valueToValidate, "^\\d{7}$");
    if (SevenDigitNumber || valueToValidate == "")
    {
        //Do your stuff.
    }
    else
    {
        //Do your stuff.
    }
}

KALEEM says:

I need a vliadation for textbox

Codition is Either I can fill 7 numeric digit oR left null text box

1 2 3

<asp:TextBox runat="server" ID="txtmail" type="enroll" value="" placeholder="enroll"></asp:TextBox>    <asp:Button runat="server" ID="btnsubmit" type="submit" Text="Submit" value="Submit"  />

Please help me.

 

Thanks

 Hi Kaleem,

Validating the textbox value whether it is numeric or not on button click event is a bit lengthy process. Instead of validating textbox value on button click, better you only allow user to enter the numeric value (ie 0 to 9) and by setting the MaxLength property of textbox you can control the input length. Just put this inside your textbox control properties.

MaxLength="7"   onkeypress="return onlyNumbers(this)"

 and add below javascript code in your head section.

function onlyNumbers(evt) {
  var e = event || evt;
  var charCode = e.which || e.keyCode;
  if (charCode > 31 && (charCode < 48 || charCode > 57)) 
  return false;
  return true;
}

And one more thing, always try to validate your data on client side only. Hope it will help you.