Asp net 2.0 null

Web Forms. Sign in to vote. User posted Gettting Object reference not set to an instance of an object in the below line of codes when the. Fallowing is the code snippet and details protected override void OnLoad System. Add content ; error details are as below Type System. NullReferenceException Message Object reference not set to an instance of an object. StackTrace at Thomson. OnLoad EventArgs e at System. LoadRecursive at System. Sunday, November 8, AM. User posted Which line exactly is it failing on?

The CodeFileBaseClass attribute is used in cases where you want multiple pages to derive from a single base class. Because of the implementation of partial classes in ASP.

NETs compilation engine will automatically create new members based on controls in the page. Therefore, if you want a common base class for two or more pages in ASP.

NET, you will need to define specify your base class in the CodeFileBaseClass attribute and then derive each pages class from that base class. The CodeFile attribute is also required when this attribute is used. The default is Always. The Auto setting will prevent ASP. NET from dynamically compiling the page if possible. Excluding pages from dynamic compilation increases performance. However, if a page that is excluded contains that code that must be compiled, an error will be thrown when the page is browsed.

This attribute specifies whether or not postback and callback events are validated. When this is enabled, arguments to postback or callback events are checked to ensure that they originated from the server control that originally rendered them. This attribute specifies whether or not ASP. NET themes are used on a page. The default is false. NET themes are covered in Module This attribute specifies whether line pragmas should be added during compilation. Line pragmas are options used by debuggers to mark specific sections of code.

This attribute specifies whether or not JavaScript is injected into the page in order to maintain scroll position between postbacks. This attribute is false by default.

When this attribute is true , ASP. Note that the src for this script block is WebResource. This resource is not a physical path. When this script is requested, ASP. NET dynamically builds the script. This attribute specifies the master page file for the current page. The path can be relative or absolute. Master pages are covered in Module 4. This attribute allows you to override user-interface appearance properties defined by an ASP.

Themes are covered in Module Specifies the theme for the page. If a value is not specified for the StyleSheetTheme attribute, the Theme attribute overrides all styles applied to controls on the page. Sets the title for the page. Sets the value for the ViewStateEncryptionMode enumeration. The available values are Always , Auto , and Never.

The default value is Auto. When this attribute is set to a value of Auto , viewstate is encrypted is a control requests it by calling the RegisterRequiresViewStateEncryption method.

Another new capability of the Page directive in ASP. Suppose, for example, that you have a public property called SomeText in your base class and you d like it to be initialized to Hello when a page is loaded. You can accomplish this by simply setting the value in the Page directive like so:. The SomeText attribute of the Page directive sets the initial value of the SomeText property in the base class to Hello!

The video below is a walkthrough of setting the initial value of a public property in a base class using the Page directive. Open Full-Screen Video. Returns the application-relative path to the page or control. Returns the relative virtual directory path to the page or control. Gets or sets the timeout used for asynchronous page handling.

Asynchronous pages will be covered later in this module. A read-only property that returns the query string portion of the requested URL. This value is URL encoded. NETs emission of client-side script. The ClientScriptManager class is covered later in this module. This property controls whether or not event validation is enabled for postback and callback events. When enabled, arguments to postback or callback events are verified to ensure that they originated from the server control that originally rendered them.

This property gets or sets a Boolean that specifies whether or not an ASP. This property returns a reference to an HtmlHead object that contains the page header. This read-only property gets the character that is used to separate control identifiers when ASP. NET is building a unique ID for controls on a page. It is not intended to be used directly from your code. This property allows for asynchronous pages. Asynchronous pages are discussed later in this module.

This read-only property returns true if the page is the result of a call back. Call backs are discussed later in this module. This read-only property returns true if the page is part of a cross-page postback.

Cross-page postbacks are covered later in this module. Returns a reference to an IDictionary instance that contains all objects stored in the pages context. You can add items to this IDictionary object and they will be available to you throughout the lifetime of the context.

This property controls whether or not ASP. NET emits JavaScript that maintains the pages scroll position in the browser after a postback occurs. Details of this property were discussed earlier in this module. This read-only property returns a reference to the MasterPage instance for a page to which a master page has been applied.

Gets or sets the master page filename for the page. This property can only be set in the PreInit method. This property gets or sets the maximum length for the pages state in bytes.

If the property is set to a positive number, the pages view state will be broken up into multiple hidden fields so that it doesnt exceed the number of bytes specified. If the property is a negative number, the view state will not be broken into chunks. Gets or sets the name of the ASP. This value must be set prior to the PreInit method. Gets or sets the ViewStateEncryptionMode of the page.

See a detailed discussion of this property earlier in this module. This property indicates whether or not the page is processed asynchronously. It is intended for use by the runtime and not directly in code.

This property returns the character used as a separator when creating unique client IDs for controls. This property returns the PageStatePersister object for the page. This property is primarily used by ASP. NET control developers. Question How can I get the full contents of the View Model passed from controller to View and back to Controller intact? Improve this question.

Have you tried using hidden form inputs? One option is using hidden fields. Another option is get the record from the database back when you return to the controller after the post. Or save it in the session not good thing but works.

If you do not need to edit the data in the view, then it would be pointless extra overhead to generate all the extra html to generate from controls, then send it to the browser and then send it all back again unchanged. Just get the data from the database again if you need it in the POST method. And the purpose of a view model is to represent the data in the view, View models DO NOT contain data models that just defeats the whole purpose of using a view model - they contains the properties of the data model that are used in the view.

Add a comment. Active Oldest Votes. There turned out to be two issues to overcome here. Improve this answer. Josh Mein Josh Mein 27k 12 12 gold badges 73 73 silver badges 84 84 bronze badges. That works but I note only on elemental properties.

My actual IssueTrackerIssue class i. This is also returned completely as null. The implication is that complex structures can't be passed to a controller. Surely that can't be the case or Master - Detail Views become a real handful. I pull the record from the database again, and I only set the values for the fields that the user is allowed to edit. Ok, which almost gets me a solution. But I'm still struggling with Master-Detail Issue. I've amended this so that Comments properties that aren't displayed are now hidden.

That's null as in no items in the collection.