How to disallow space in between and special characters server side in ASP.NET with C#?

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I want to disallow space in between and special characters server side in asp.net with c#. For instance if the text is jebin user/jebin.user/jebin@user etc it must validate else if it is jebin and simply space it must go fine.

What I have tried:

js validation is used which is not working.

Posted 10-Feb-17 3:28am

Ema112

Updated 10-Feb-17 5:25am

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[no name] 10-Feb-17 9:34am

"js validation is used which is not working.", if that is the C# code that you have tried, I can see why you are having trouble.

Karthik_Mahalingam 10-Feb-17 9:45am

not clear.
Provide more info.
use Improve question to update the question.

F-ES Sitecore 10-Feb-17 9:46am

We don't know how you are validating your data so can't possibly help you. This is why it is important to post the relevant code.

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OriginalGriff · Answer 1 · 2017-02-10T04:09:00

First, trim your string:

C#

string input = myTextBox.Text.Trim();

Then just use Linq methods:

if (input.Any(c => !char.IsLetterOrDigit(c)))
    {
    // Contains special character
    ...
    }

But me? I'd do it in javascript as they typed rather than as a "final validation" on the server.

Bryian Tan · Answer 2 · 2017-02-10T05:25:00

Or, you can employ the RequiredFieldValidator and RegularExpressionValidator

Assuming this is ASP.NET webform and the valid letter are a-z,A-Z and 0-9, then on the UI

ASP.NET

<asp:TextBox ID="TextBox2" runat="server" CausesValidation="True"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" Display="Dynamic" ErrorMessage="*" ControlToValidate="TextBox2"></asp:RequiredFieldValidator>
        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox2" Display="Dynamic" 
            ErrorMessage="letter and number only" ValidationExpression="^[a-zA-Z0-9]+$"></asp:RegularExpressionValidator></div>

and in the code behind/server side

C#

if (Page.IsValid)
        {
            //pass validation, do server side processing. To test this part, disable the JavaScript on the browser
        }

How to disallow space in between and special characters server side in ASP.NET with C#?

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