How Can Parameters Prevent SQL Injection in VB.NET Database Updates?

Utilizing Parameters to Safeguard SQL Queries in VB

In VB, it is essential to employ parameters when updating SQL databases to prevent SQL injection attacks. Consider the following code aimed at updating a database table:

dbConn = New SqlConnection("server=.\SQLEXPRESS;Integrated Security=SSPI; database=FATP")
    dbConn.Open()

    MyCommand = New SqlCommand("UPDATE SeansMessage SET Message = '" & TicBoxText.Text & _
                                            "'WHERE Number = 1", dbConn)

    MyDataReader = MyCommand.ExecuteReader()
    MyDataReader.Close()
    dbConn.Close()

When confronted with input containing special characters like single or double quotation marks, this code can crash. To rectify this issue, you must utilize parameters, specifically named parameters that resemble variables in programming languages.

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

In this code, "@TicBoxText" is employed as the parameter name and the value is supplied via "AddWithValue." The command effectively becomes self-contained, safeguarding it from user manipulation. The "ExecuteReader" method can then be safely executed without interference.

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