Question

Scenario:
I have to check for user input (a string) that shouldn’t contain <.%?/ symbols and if it does I remove them. I have 20 different places where I’ve to check it, actually, 20 different pages with each 20 different controls.

So I wrote a function like the following shortened example:

public string MyFunction (string userinput)
{
    return userinput.replace("<"," ");
}

Now if I want to call this function from within another function and there’s an error in this function’s try catch block I want it to write an error to a Label on the main page, without interrupting the second function.
Also i am thinking of implementing conditional statement function calls too.

Answer 1

Usually it’s best to let the calling function catch your error and to act upon it. Something like this (assuming C#, but your question wasn’t clear about that and didn’t have a working example):

try {
    string resplacedString = yourReplaceFunction(userInput);
} catch (MyException e) {
    Label1.Text = "An error occurred." + e.Description;
}