How to Securely Update SQL Databases with Special Characters Using VB.NET Parameters?

Using Parameters with "@" in SQL Commands in VB

To update a database with data containing special characters, it's essential to use parameters to prevent SQL injection vulnerabilities. This article explores how to utilize parameters effectively in VB.

In the example code, the attempt to use parameters is incorrect. To define a parameter, use @ before its name and assign its value using the AddWithValue method of the Parameters collection, like this:

MyCommand = New SqlCommand("UPDATE SeansMessage SET Message = @TicBoxText WHERE Number = 1", dbConn)
MyCommand.Parameters.AddWithValue("@TicBoxText", TicBoxText.Text)

This approach creates a named parameter (@TicBoxText in this case) and assigns the value from the textbox to it. The SQL command becomes self-contained, preventing malicious users from modifying the command text.

By separating the command definition from the value assignment, you ensure the integrity of your SQL execution and protect your database from potential security risks.

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