disallow special chracter and list of words

[newcoder10]

Hi All,

I would like to know what's the best way to write function(global ) in asp.net c# Framework 2.0 to check for textbox in a form (i have about 80 textbox on one form and I have many forms and textarea
and I have list of 90 ro 100 words and special chracter that I do not want user to enter. If they enter the item from the list of blocked word or character I want to give them error saying "this character or word in not allowed, please correct it"
The site is getting many hits already so I want to make sure it's not going to slow down a lot. I want to give the message as soon as one of the word or special character listed is found and not want to continue checking further.

e.g of block list word "abc","bbc","bb d","cbc","xbc", "~","^","'" . the list can change in the future.

I am new to asp.net and appreciate any help.

Thanks
newcoder

[sanjib65]

Blocking Special character or words

The simplest way that comes to my mind is using if/else constructor where you have to mention those charaters and words.

[Frinavale]

I typically have a "Utils" class that just has a bunch of public static/shared methods that help me do things like print to a log etc.

I seen no reason why you can't use such a class in your application to do validation. You can call these methods from anywhere in your application.

-Frinny

[newcoder10]

your are right. Honestly I am very new to this and I do not know how to right such a function. Any help in sarting to write this function would be great.

Thanks

[semomaniz]

Create an array and store all the words inside the array. Then use a for each loop and do the validation rather than using if else statement. Also as Frinny stated create a utility class to do the validation, This makes code much cleaner and more oop.

[newcoder10]

Hi semomaniz,

I am new to this and I do not know how to create array. I searched all over the internet and I could not find one. I found a few that will replace the bad word or special character but I do not want to filter. I just want to give the message saying this word is not allowed. I just need someone to help me give an example and I will enter all the words.

Thanks for your help

[semomaniz]

here is the utility class, you go to add more data and any other validation that you require. The isvalid method returns boolean and is used to validate the data. now on the button event you will validate the data if it returns false then display your desired error

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;

public class Utility
{
	//data member
	private string _InputText;
	
	//constructor
        public Utility() { }
	public Utility(string datatovalidate)
	{
		this.ValidationText = datatovalidate;
	}

	//getter n setter
	public string ValidationText
	{
		get { return _InputText; }
		set { _InputText = value; }
	}
	
	//method	
	public bool IsValid()
	{
		bool result = false;
		//creating ArrayList 
		ArrayList mydata = new ArrayList();
		
		myData.Add("abc");
		myData.Add("ggc"); 
		//now add all the unwanted data here
		
		
		foreach (string x in myData)
		{
			if ( x.Equals(this.ValidationText))
			{
				return result;
			}
			else
			{
				result = true;
			}
		}
		return result;
	}
	
}

[Frinavale]

@semomaniz:
Since newcoder10 doesn't even know how to declare an array I don't think that your class is going to make sense to them.

@newcoder10:
You are going to have to do your part in learning the basics. Knowing how to declare an array is extremely basic..in fact I'm not even sure what tutorials would be good for you because most articles out there assume that you know things like how to declare an array, how to use if statements, and how to use loops. Another reason why I don't know where to point you to is because you haven't stated what programming language you're using to develop your sever side logic. Are you using C#? Are you using VB.NET?

-Frinny

[newcoder10]

Hi semomaniz,

Thanks for your help. I will play with this. I reall appreciate the code.

Dear Frinny, Thanks for your comments I am doing my part in learning and appreciate your willingness to direct me to tutorial. BTW I did mentioned above "asp.net c# Framework 2.0 " Sorry if my english isn't that well.

Thanks again to all of you.

[Frinavale]

Sorry newcoder10... I was concentrating more on your problem and over looked that.

Just a sec and I'll find you some simple tutorials to help you learn C#.

-Frinny

[newcoder10]

Hi Frinny,

Please no need to apologize, I should be thankful to your comments and help. I am glad I found and joined the site. I am sure I will learn a lot from all you gurus.
Once again thanks a lot for your patience, for helping and directing me to right path.

Thanks again.

[Frinavale]

The best place to start learning anything about .NET is on the MSDN Library. You should be able to use the library's search option to find help on just about anything that you want to learn about. This resource is very powerful, it has articles on every topic and every control. I use it almost every day (especially when I'm doing research). I recommend bookmarking it and using it as your primary resource when doing any development in .NET

There are tutorials there on how to use Arrays in C#.

I also recommend that you check out:

• C# Selection Statements
• C# Iteration Statements
• All of the articles under the C# Classes tree
• C# Exception Handling Statements
• And the ASP.NET Life cycle.

It's important to understand the ASP.NET life cycle but first you need to understand the basics: arrays, logical conditional statements, classes and events.

**edit**
Ooo this one looks good too C# Programming Guide


-Frinny

[newcoder10]

Frinny,

Thanks again for all the help. I will try to limit asking basic questions and will read and research before posting.

Thanks alot.

[Frinavale]

:) If you need help understanding something feel free to ask too :)
It's easier to help you if you have some sort of starting point...like a chunk of code or something...as apposed to "how do I do validation", which could be a huge topic.

-Frinny

[newcoder10]

Hi semomaniz,

I created the class file and it looks ok. I had one error message about case on myData and I changed that it does not have any error, I am trying to call this method on click event and not sure how to do it.
Again I am sorry for asking this basic question.

Thanks