Update sql table data using asp.net

Private Sub UpdateTest()
        Try
            Dim SqlCmd As SqlCommand
            Dim SqlCon As SqlConnection
            Dim strConString As String
            Dim SqlQuery As String = String.Empty

            strConString = System.Configuration.ConfigurationManager.ConnectionStrings("Cn").ConnectionString
            SqlQuery = "UPDATE Staff SET TEST='HI' WHERE ID = 12"

            SqlCon = New SqlConnection(strConString)
            SqlCmd = New SqlCommand(SqlQuery, SqlCon)
            SqlCon.Open()
            SqlCmd.ExecuteNonQuery()

            SqlCon.Close()
            SqlCmd.Dispose()
            SqlCon.Dispose()
        Catch ex As Exception
            lblMsg.Text = "Error"
        Finally
            SqlCon.Close()
            SqlCmd.Dispose()
            SqlCon.Dispose()
        End Try
    End Sub