Trying to use ExecuteNonQuery on Command crashes

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Hi.
I'm using the ExecuteNonQuery command, and everytime I try running it, I get
this error: "An unhandled exception of type
'System.Data.OleDb.OleDbException' occurred in system.data.dll".
When I run the SQL in ACCESS itself, it work perfectly.
I would appriciate any help.

This is my code:

Dim NewConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data
Source=c:\db1.mdb"

Dim NewConnection As New OleDbConnection(NewConnectionString)

Dim NewSQL As String = "UPDATE Important_Dates SET session = 3 where college
= 'CAS'"

Dim NewCommand As New OleDbCommand(NewSQL, NewConnection)

NewCommand.Connection.Open()

NewCommand.ExecuteNonQuery()
.