How to Resolve the Obsolete `MySqlCommand.Command.Parameters.Add` Warning and Prevent SQL Injection?

MySqlCommand.Command.Parameters.Add Obsolete Warning: Transition to AddWithValue

Question:

While using MySqlCommand to insert data into a MySQL database, you receive a warning indicating that "MySqlCommand.Command.Parameters.Add is obsolete" and the parameter values are not being inserted correctly. How do you resolve this issue and ensure SQL injection safety?

Answer:

To address the warning and improve SQL injection prevention, you should transition from using "Add" to "AddWithValue" for adding parameters to your MySqlCommand.

Modified Code:

...
command.Parameters.AddWithValue("@mcUserName", mcUserNameNew);
command.Parameters.AddWithValue("@mcUserPass", mcUserPassNew);
command.Parameters.AddWithValue("@twUserName", twUserNameNew);
command.Parameters.AddWithValue("@twUserPass", twUserPassNew);
...

Additional Considerations:

• Remove the single quotes around the parameter placeholders in your SQL statement:

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

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