Error in Walkthrough: Using a Custom Action to Create a Database at Installation

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C#

VB

Visual-Studio

after i completed all the steps that is given in this tutorial Walkthrough: Using a Custom Action to Create a Database at Installation[^]
i got the following error in the middle of the installation process :
Error 1001.Object reference not set to an instance of an object
please help me with this...
provide me with your email address and i will send the solution i made with that tutorial...please help me to find out the error in it...

regards
Arpan

[edit]Code block removed, link converted to link - OriginalGriff[/edit]
[edit]Added OP's reply to the original post - Naerling[/edit]

the code didn't showed any problem in it..i rechecked my steps with the given steps in the tutorial but i did exactly what stated in the tutorial....
though i use c# but the code was given in vb so i used converter to change the vb code to c#
this is the website i used for the conversion

http://www.developerfusion.com/tools/convert/vb-to-csharp/

In the code,

private void ExecuteSql(string DatabaseName, string Sql)
    {
        System.Data.SqlClient.SqlCommand Command = new System.Data.SqlClient.SqlCommand(Sql, masterConnection);

        // Initialize the connection, open it, and set it to the "master" database
masterConnection.ConnectionString = My.Settings.masterConnectionString;
        Command.Connection.Open();
        Command.Connection.ChangeDatabase(DatabaseName);
        try {
            Command.ExecuteNonQuery();
        } finally {
            // Closing the connection should be done in a Finally block
            Command.Connection.Close();
        }
    }

but this line didn't worked i think due to the framework version compatible issues...
masterConnection.ConnectionString = My.Settings.masterConnectionString;
....
it specified the error as "the name 'My' is not in the context"
so i changed the code with
masterConnection.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["dbCustomAction.Properties.Settings.masterConnectionString"].ToString();
adding a refrence of system.Configuration
so this code didn't showed any problem...
now i don't know where specifically my problem resides...
can you now help me with this??