Ehy guys i have these instructions :

What's the value of "parametri[0]"? Does it look like an integer value?

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No, it's a string. :)

Sure, I understand that.... but what's the content of the string? What's the string's value not it's type.

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the string's value is 'XXNNXX'

Let me ask you a question then...

If I asked you this question:

What number is best represented by thecharacters"XXNNXX"?

What would you say?

You'd probably say I was crazy. "XXNNXX" isn't anumber at all... it's a bunch of letters.

That's what you're asking the computer to do, however, by asking it to convert to an integer value.

To convert to Int32 from string, your string has to be a series of numbers.... like "123" or "456" or "1", etc.

Does that make sense?

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Coding Light - Illuminated Ideas and Algorithms in Software
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Let me ask you a question then...

If I asked you this question:

What number is best represented by thecharacters"XXNNXX"?

What would you say?

You'd probably say I was crazy. "XXNNXX" isn't anumber at all... it's a bunch of letters.

That's what you're asking the computer to do, however, by asking it to convert to an integer value.

To convert to Int32 from string, your string has to be a series of numbers.... like "123" or "456" or "1", etc.

Does that make sense?

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sorry...i'm crazy..not you:)..i have controlled and finally i'll says you that parametri[0] is a number '1' '2' and so on ...NOT 'XXNNXX'..do you understand ?

So is it fixed? If so, mark one of the helpful posts as answer.

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Coding Light - Illuminated Ideas and Algorithms in Software
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..however i don't understand why dont reach the conversion with this instruction...help meeee :)

Could you be more specific?

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Coding Light - Illuminated Ideas and Algorithms in Software
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Hi,
Are you still troubled by the exception?
If I encounter such error when convert a string to an int value, I will set a breakpoint at that line, run the program, when the breakpoint is hit, check the value of parametri[0] to make sure it is a sequence of digits.
By the way, Int32.TryParse method provides a friendly way to do the conversion, a "false" instead of an exception will be returned if the given string is not a valid int value.

Thanks,
Eric

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