What Is Wrong With My Codes To Connect VB.net To Sql Server 2005 Express Database?

Hi am very new with VB.net (Visual Studio 2005) and the first time try to use the sql server 2005 express. I did create a trial.mdf (local server) and complete procedure to attach the trial1.mdf in Microsoft SQL Management Studio Express.

I try to use VB to connect /open/close it with the following codes: (but failed)

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Imports System.Data.SqlClient

Public Class Form1
'Link database
Dim DB_Location = "c:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDataTrial1.mdf"
Dim MyConnection = "Server=localhost; DataBase= " & DB_Location & "Integrated Security=SSPI"
Dim sqlConnection As New SqlConnection(MyConnection)

'Use database
Dim strSQL As String = "SELECT FROM Trial1 WHERE col2 = 'trial' "
Dim cmd As New SqlCommand(strSQL, MyConnection)

sqlConnection.Open()  ' ----> error
cmd.ExecuteNonQuery() ' ----> error
sqlConnection.Close() ' ----> error

End Class


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At the last 3 line of codes I got the errors ... can someone explain why & help me to correct it?

Thanks for any help