Multimobile Development: Building Applications for any Smartphone
System.DBNull Class
Information   Base Types   Related Resources

Represents a null value.

  • Namespace: System
  • Assembly: mscorlib.dll

  • System.Object
    System.Runtime.Serialization.ISerializable
    System.IConvertible
  • View this type on MSDN
  • Search for this type on MSDN using MSDN's own search engine
  • Google for this type - all Web
  • Google for this type - MSDN only
    Articles (16)Discussions (834)MembersRotor
    Articles

    Page: 1
    Ask the DotNetJunkies: ASP.NET Server Controls vs. ActiveX Controls - Round 1
    DotNetJunkies
    How does the web server download the new event driven control to client side in ASP.NET? Would it be something like ActiveX Control or just scripting? Would this be supported in any type of browser? Thank you!
    Beyond DataBinder
    The Code Project
    An alternative to the standard DataBinder that can handle missing data and validation failures
    BUG: The Scale Value for Oracle Numeric Parameter Is Ignored (Q317528)
    http://www.kbalertz.com/
    When you set the scale for a parameter of type NUMBER, it does not affect the value of the parameter that is passed to the database.
    Data Binding
    C#Today
    ADO.NET, the database connectivity library included with the .NET Framework, provides powerful ways of working with data from all kinds of data sources. Underpinning most of the ADO.NET functionality is XML.In this exercise, Matthew Reynolds takes a look at working with XML and Data Binding. Specifically, he shows how we can create an application that lets us store a small database of Web sites in an XML file on disk.
    DataLoaders - Unified Data to Object Binding
    The Code Project
    A framework to completely separate objects from their data source - allowing any data source to be used without prior consideration in your code or designs. Databases, text files, web services and potentially anything else can all be used or swapped transparently.
    Hardcore Visual Studio .NET: Using DataReaders to Increase Speed and Reduce Memory
    MSDN
    Rick Dobson shows you how to take advantage of the DataReader's high performance and low memory requirements in database connections.
    HOW TO: Extend the Windows Form DataGridTextBoxColumn Control to Custom-Format Data (Q318581)
    Microsoft Support
    This step-by-step article describes how to extend the Windows Form DataGridTextBoxColumn control so that you can custom-format your data for display and editing in a Windows Form DataGrid.
    HOW TO: Extend the Windows Form DataGridTextBoxColumn Control to Custom-Format Data (Q318581)
    http://www.kbalertz.com/
    This step-by-step article describes how to extend the Windows Form DataGridTextBoxColumn control so that you can custom-format your data for display and editing in a Windows Form DataGrid.
    HOW TO: Implement a DataSet GROUP BY Helper Class in Visual C# .NET
    http://www.kbalertz.com/
    (326145) - This step-by-step article describes how to implement and how to use a DataSetHelper class that includes sample code to create a DataTable object that contains aggregate data from another DataTable object. To do this, use the following public methods:...
    HOW TO: Make a Typed DataSet Return a Default Value Instead of DBNull by Using Visual Basic .NET
    Microsoft Support
    (318039) - This step-by-step article describes how to change the XML Schema file to make a typed DataSet return a default value instead of DBNULL. Visual Studio .NET may return an exception if the value of a DataRow is DBNULL, so you must handle the exception...
    HOW TO: Make a Typed DataSet Return a Default Value Instead of DBNull by Using Visual Basic .NET
    http://www.kbalertz.com/
    (318039) - This step-by-step article describes how to change the XML Schema file to make a typed DataSet return a default value instead of DBNULL. Visual Studio .NET may return an exception if the value of a DataRow is DBNULL, so you must handle the exception...
    Migrating AnandTech from Macromedia ColdFusion to ASP.NET
    MSDN
    AnandTech migrated to Microsoft Windows 2000 Server, with ColdFusion MX serving up its dynamic pages.
    PRB: InvalidCastException When You Bind DateTimePicker That Contains a Null Value (Q313513)
    http://www.kbalertz.com/
    When you bind a
    Selectively Enable Form Validation When Using ASP.NET Web Controls
    MSDN
    Sometimes the extra controls that come with Visual Studio .NET can be a bit inflexible or they just don't provide enough functionality or flexibility for all situations. The ASP.NET form validation controls, while powerful and easy to use, require that the entire page be valid before it's submitted back to the server. Through the use of the new object-oriented features of Visual Basic .NET, it is possible to extend their functionality to overcome this limitation. This article tells you how and helps you decide when it's a good idea to keep validation on the client and when you'd be better off disabling it.
    Setting Database Values to Their Uninitialized State
    DotNetJunkies
    Ask the DotNetJunkies - In this How To Doug shows you how to use System.DBNull to set a database field to its uninitialized state.
    Two-Way Data Binding in ASP.Net
    The Code Project
    Demonstrates how to get Two-Way databinding working in ASP.Net without subclassing all your controls
    Ad
    BootFX
    Reliable and powerful .NET application framework.
    iOS, Android and Windows Phone Development Training and Consultancy
    Hosted by RackSRV Communications
     
    Copyright © AMX Software Ltd 2008-2012. Portions copyright © Matthew Baxter-Reynolds 2001-2012. All rights reserved.
    Contact Us - Terms of Use - Privacy Policy - 4.0.30129.1734

    Hi! 10 years ago I founded .NET 247. I am working on a new and exciting replacement for the site. Please join me on Twitter to discuss.

    Thanks,
    Matthew Baxter-Reynolds (@mbrit)

    Follow mbrit on Twitter