Why is `AddWithValue()` Preferred Over `Add()` for Preventing SQL Injection in MySQL?

Command.Parameters.Add() is Deprecated: Using AddWithValue() in MySQL Query Injection

The usage of Command.Parameters.Add() in MySQL queries has been deprecated for security reasons. To ensure query injection safety, it is recommended to use the AddWithValue() method instead.

Here's how to update your code to use AddWithValue():

string SQL = "INSERT INTO `twMCUserDB` (`mc_userName`, `mc_userPass`, `tw_userName`, `tw_userPass`) VALUES (@mcUserName, @mcUserPass, @twUserName, @twUserPass)";
command.CommandText = SQL;
command.Parameters.AddWithValue("@mcUserName", mcUserNameNew);
command.Parameters.AddWithValue("@mcUserPass", mcUserPassNew);
command.Parameters.AddWithValue("@twUserName", twUserNameNew);
command.Parameters.AddWithValue("@twUserPass", twUserPassNew);

By using AddWithValue(), you eliminate the risk of including special characters or malicious SQL commands in your query, thereby preventing SQL injection attacks.

The original SQL query, which wrapped the placeholders with single quotes, was also a security vulnerability. The correct format for an SQL query in MySQL is to use backticks (`) instead of single quotes for field and table names. Therefore, the updated SQL query should look like this:

string SQL = "INSERT INTO `twMCUserDB` (`mc_userName`, `mc_userPass`, `tw_userName`, `tw_userPass`) VALUES (@mcUserName, @mcUserPass, @twUserName, @twUserPass)";

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