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Selected Item in Dropdownlist in an Usercontrol

Posted Date: 12 Sep 2006	Resource Type: Articles	Category: Web Applications
Author: Harish Ranganathan	Member Level: Gold
Rating:	Points: 10

Introduction

A Common requirement we have would be to have a Dropdownlist of items which would be common across all the pages (top navigation or in the left navigation).

Normal retrieving of selected Item in Dropdownlist

Retrieving the selected item in a dropdownlist which resides in the same page, is pretty straight forward dropdownlist1.selecteditem.value.

Dropdownlist in Usercontrol

However, when it is in a usercontrol, its pretty difficult to retrieve it since you will get the "Object Reference not set to an instance" error if you try the normal method. Even if you create an instance of the usercontrol and try to access its dropdownlist, you will get the above error.

The following code demonstrates how to overcome this problem.


UserControl objCtrl = ((UserControl)(FindControl("Id of the Usercontrol as declared in the container page")));

DropDownList ddl = ((DropDownList)(objCtrl.FindControl("Id of the Dropdownlist control in the usercontrol")));

Response.Write(ddl.SelectedItem.Value);

Thats it and you can access the value.

Summary

Accessing a control within the Usercontrol is a little tricky and involves doing a Findcontrol and hope this article throws light on the same.

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