It requires less client- logic and is quicker to implement. Page returned null from within a nested user control. It is however, worth considering ' s own partial- rendering techniques returning HTML. If such a control is found it is returned; if no matching control is found FindControl returns null.
UserControl class. The issue here is usually due the the load mechanics of user controls, they load after the page typically. 0 the beauty of 2. Every server control includes a FindControl( " controlID" ) method that searches the control' s descendents for a control named controlID.
Explains how to get web site thumbnail image using 2. 5 with nested masterpages.
Hello, I' m struggeling a little with the following: I use 3. Asp net custom control page is null.
I have a content page ( aspx) from er controls behaves like miniature pages web forms which could be used by many other pages. So as a result the controls have not yet been initialized on your usercontrol ( causing the null ref) during the containing page_ load method. Ajax technology and JSON makes this partial- rendering easy. These are derived from the System.
During page load, all child controls receive the OnLoad event. For any browser- based application it makes sense to load into the web page just the content that is immediately required avoid whole- page refreshes whenever possible. When you try to access controls defined in the control' s markup in the OnLoad method override, all markup controls are NULL. For more information implementing composite controls, device types, maintaining state, handling different browser , defining properties, including information about rendering see Developing Custom Server Controls.
These controls have the following characteristics: To understand the concept let us create a custom control which will simply render. However with data- bound Web controls. Home / Forums / Advanced / Custom Server Controls / Dyanmic User Control: Child Controls are null Dyanmic User Control: Child Controls are null [ Answered] RSS 3 replies. Web Parts are amazing features that come in 2.
For example, an exception is thrown if you try to bind the SelectedValue of a DropDownList control to null. Handler to get the page object worked fine.