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.Net Cache Datatable with CacheDependency

February 10, 2012
      Shared Function TestData(Optional ByVal refresh As Boolean = False) As DataTable
            OpenIssues = DirectCast(HttpRuntime.Cache("TestData"), DataTable)
            If TestData Is Nothing Or refresh Then
                Dim sql As New System.Text.StringBuilder
                sql.Append("SELECT  Field1, Field2, Field3, Field4  ")
                sql.Append("FROM   dbo.TestData ")
                sql.Append("ORDER  BY Field1 ")
                Using cn As New SqlConnection(Conn)
                    Using cmd As New SqlCommand(sql.ToString, cn)
                        Using dep As New SqlCacheDependency(cmd)
                            TestData= New DataTable
                            cn.Open()
                            TestData.Load(cmd.ExecuteReader(CommandBehavior.CloseConnection))
                            HttpRuntime.Cache.Insert("TestData", TestData, dep, Cache.NoAbsoluteExpiration, TimeSpan.FromHours(24))
                        End Using
                    End Using
                End Using
            End If
        End Function
    
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