User Controls and Client Side Scripting - Utilizing the UserControls

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While utilizing the user controls in a web form it must be registered in the form at declaration section. For example, if our control file is named as “MyScriptControl.Ascx”, it must be registered using this control: 


<%@ Page Language="Vb"  %>
<%@ Register TagPrefix="MyUserCtl" TagName="MyTag" src="MyScriptControl.Ascx" %>



Each server control has “<Asp:” prefix at declaration. For user controls, we have to define our prefix. For our control we use TagPrefix  “MyUserCtl”.  Tagname is the reference of the control instance in the form and the source of the user control. Src is the source file which contains the code for the user control.

When time comes to use the user control declare a tag by using the following familiar format:


<MyUserCtl:MyTag Id="MyTagCtl" runat="Server" />



We can add attributes according to the requirement (example:  ViewState=”true”). As we discussed earlier we can add the Javascript in the Aspx page for the actions of the controls which are placed in the user control. We must remember that the TagId used in this declaration is the prefix which we applied to the controls id in the user control (I.e.  'MyTagCtl_MyText). To avoid this complex naming mechanism we can use “this” also.

Run the aspx form and click on the checkbox and on textbox to see controls in action. Congratulations, we now have our first user control!

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