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While providing security to web applications we are avoiding special characters inputs from GUI.
But any client want to allowed the special characters in some fields then how to handle special characters validations.
Posted

I'm assuming you are talking about preventing SQL injection by stopping users typing their user name as

max;delete from customer;

for example?

But then a customer of yours comes along and wants to enter a lit of items separated by semi-colons?

Essentially you just need to make sure you aren't vulnerable to injection attacks regardless of the text entered.

Don't build your SQL strings by concatenation, for example.

Use stored procedures rather than direct SQL (a matter of preference)

Use parameterised queries

Utilise a database user that does not have access to tables directly (i.e. only through SP and Views)
   

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