My code works but I need to understand a part

Protected Sub Submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Submit.Click
        Dim name, address, nice As String
        Dim sConnString, sSQL As String
        Dim u As MembershipUser
        'Receiving values from Form, assign the values entered to variables
        'name = Request.Form("name")
        'address = Request.Form("address")
        name = Me.name.Text
 
        address = Me.address.Text
 
 
        u = Membership.GetUser(User.Identity.Name)
        nice = u.ToString()
 
        'comments = Request.Form("comments")
 
        'declare SQL statement that will query the database 
        sSQL = "INSERT into test ([Address],[Name], [username]) values ('" & _
        address & "', '" & _
        name & "', '" & _
        nice & "')"
        'MsgBox(sSQL)
        'define the connection string, specify database
        'driver and the location of database
        sConnString = ConfigurationManager.ConnectionStrings("aspnetdbConnectionString1").ConnectionString.ToString()
 
        'create an ADO connection object 
 
        Using MyConnection As New System.Data.SqlClient.SqlConnection(sConnString)
            Dim MyCmd As New System.Data.SqlClient.SqlCommand(sSQL, MyConnection)
            MyConnection.Open()
            MyCmd.ExecuteNonQuery()
            MyConnection.Close()
        End Using
 
        Response.Redirect("transferred.aspx?value=2")
 
    End Sub
End Class