Validate if the value entered is correct

Question

1.00/5 (3 votes)

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.NET3.5

Hi
I need to validate a string against the entered string.
eg:
string to be validated is "hello"

if i enter hullo,it should return false

thanks

Posted 7-Jun-12 13:41pm

DepiyaReddy

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Sergey Alexandrovich Kryukov 7-Jun-12 21:32pm

You need to tag application type or UI library to be used, as soon as this is related to UI. Please see the explanation in the answer by VJ Reddy.
--SA

2 solutions

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VJ Reddy · Accepted Answer · 2012-06-07T15:28:00

The question is not tagged with UI type WindowsForms, WPF, ASP.NET etc. and it is not mentioned which control is to be validated.

In WindowsForms the Validating event of the Control can be used to test for a condition and if the condition is not satisfied then the System.ComponentModel.CancelEventArgs argment property Cancel can be set to true to retain focus in the Control till the condition is satisified.

If a TextBox is to be validated in WindowsForms then the following code can be used

C#

textBox1.Validating += (sender, args) => {
    if(!textBox1.Text.Equals("hello", StringComparison.InvariantCulture))
        args.Cancel=true;
};

If the purpose is only to a have function to check for the condition then the following method using string.Equals method can be used as it offers StringComparison.InvariantCulture option.

C#

public bool IsValid(string stringToTest){
   return stringToTest.Equals("hello",StringComparison.InvariantCulture);
};

John Orendt · Accepted Answer · 2012-06-07T14:33:00

Solution 1

C#

bool validate(String str)
{
   bool rv=false;
   if(str=="hello")
   {
      rv=true;
   }
   return rv;
}

Posted 7-Jun-12 14:33pm

John Orendt

Updated 7-Jun-12 14:34pm

v2

Comments

Sergey Alexandrovich Kryukov 7-Jun-12 21:36pm

A vote of 1:
If you decided to write trivial thing (I doubt OP would need it), you could at least write without all that foolishness:

bool validate(string value) {
   return value == "hello";
}

In this case, writing more than one line is nearly a crime. Your vote of 1 is well deserved.

Please also keep in mind that you should only answer question on the matter you know really well. Bad answers in more harm than help and much worse than not answering at all. Please be responsible.

--SA