.NET Tips and Tricks

Blog archive

Storing Data About a DataSet with the DataSet

While DataSets hold a lot of data, sometimes you want to keep track of information about the DataSet itself. You could store information about the dataset in some variable (e.g. the last time you checked the DataSet for changes) but it makes sense to me to store that information with the Dataset itself through its extended properties.

To add an extended property to a DataSet, you go the DataSet's ExtendedProperties collection and add a name and a value. This example adds a property called LastChecked to the ExtendedProperties collection with the current date and time:

Dim ds As New DataSet
ds.ExtendedProperties.Add("LastChecked", DateTime.Now)

To retrieve your extended property, just pass the name back to the DataSet's Item method. When you retrieve an item from this collection it comes back as an Object, so you'll need to convert the value when you retrieve it:

Dim stDate As String
Dim dtDate As DateTime

stDate = ds.ExtendedProperties("LastChanged")
If String.IsNullOrEmpty(stDate) = True Then
  dtDate = DateTime.MinValue
  dtDate = Convert.ToDateTime(stDate)
End If

If dtDate < DateTime.Now AndAlso
   ds.HasChanges = True Then
  '... process DataSet
End If

Posted by Peter Vogel on 07/19/2011 at 1:16 PM

comments powered by Disqus


  • ML.NET Improves Object Detection

    Microsoft improved the object detection capabilities of its ML.NET machine learning framework for .NET developers, adding the ability to train custom models with Model Builder in Visual Studio.

  • More Improvements for VS Code's New Python Language Server

    Microsoft announced more improvements for the new Python language server for Visual Studio Code, Pylance, specializing in rich type information.

  • Death of the Dev Machine?

    Here's a takeaway from this week's Ignite 2020 event: An advanced Azure cloud portends the death of the traditional, high-powered dev machine packed with computing, memory and storage components.

  • COVID-19 Is Ignite 2020's Elephant in the Room: 'Frankly, It Sucks'

    As in all things of our new reality, there was no escaping the drastic changes in routine caused by the COVID-19 pandemic during Microsoft's big Ignite 2020 developer/IT pro conference, this week shifted to an online-only event after drawing tens of thousands of in-person attendees in years past.

  • Visual Studio 2019 v16.8 Preview Update Adds Codespaces

    To coincide with the Microsoft Ignite 2020 IT pro/developer event, the Visual Studio dev team shipped a new update, Visual Studio 2019 v16.8 Preview 3.1, with the main attraction being support for cloud-hosted Codespaces, now in a limited beta.

Upcoming Events