How to validate textboxes in vb,net

Question

0.00/5 (No votes)

See more:

.NET3.5

Hi I am trying to restrict my user from inserting characters or special chars,spaces etc only numbers are allowed, i also want to restrict sql injection. Please help me with a code.

Posted 6-Aug-10 0:51am

souvikd

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Adesina Mark · Answer 1 · 2010-08-06T03:20:00

Solution 1

If you want to restrict user from inerting xters then use this code:

If Not IsNumeric(Trim(Nameoftextbox.text))Then

'Display messagebox here

Return

End If

Now, Use parameter to avoid sql injection

Posted 6-Aug-10 3:20am

Adesina Mark

Sandeep Mewara · Answer 2 · 2010-08-06T06:16:00

Solution 2

If you want any specific format, then either use Masked textbox or use Regular Expression as validation expression on KeyUp event of textbox.

Posted 6-Aug-10 6:16am

Sandeep Mewara