Vulnerability findings by Rational Appscan on Authentication Credentials using .Net Language

Hello Experts,

Our Security team is using Rational Appscan software for scanning applications from any kind of Vulnerability’s and sensitive information’s that may allow malicious users to obtain. However, the result I get from the software is classified under three categories:

Authentication.Credentials.Unprotected
Authentication.Credentials.Weak
Injection.DBConnectionString

Theses Vulnerabilities or categories are pointed to line number 2  as follow:

Sub Read()
        Using connection As New SqlConnection(ConfigurationManager.ConnectionStrings("LocalSqlServer").ToString())
            Const queryString As String = "SELECT Name from Users where SAPID = @SAPID"
            Dim command As New SqlCommand(queryString, connection)
            Dim parUsername As New SqlParameter("@SAPID", SqlDbType.VarChar, 20)
            parUsername.Value = TextBox1.Text
            command.Parameters.Add(parUsername)
            command.Connection.Open()
            Using reader As SqlDataReader = command.ExecuteReader(CommandBehavior.CloseConnection)
                ' Call Read before accessing data.
                If reader.HasRows Then
                    While reader.Read()
                        Label1.Text = reader("Name")
                    End While
                End If
            End Using
        End Using
    End Sub

The connection string in the web.config file is encrypted using RSA with a Machine-Level Key Container.

The connection string before it is encrypted is as as follow:

<connectionStrings>
  <add name="LocalSqlServer" 
      connectionString=";Database=;User ID=;Password=;Trusted_Connection=False;"/>
</connectionStrings>

Can someone tell me whey the SQL statement above is Vulnerable.

Thanks.