How to set a value dynamically for dropdownlist in code behind C#

Question

I need to set value "Y" to dropdownlist control dynamically.When i tried by selectedValue it gave error like object reference is null .plz help

codeandcloud · Accepted Answer · 2011-07-01 05:53:50Z

3

First make sure that Y is there inside your asp:DropDownList. Then do this

if (DropDownList1.Items.FindByValue("Y") != null)
{
     DropDownList1.Items.FindByValue("Y").Selected = true;
}

answered Jul 1, 2011 at 5:53

codeandcloud

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pinki · Accepted Answer · 2011-08-01 09:44:24Z

1

Assuming that "Y" is in your dropdownlist:

DropDownList1.SelectedValue=DropDownList1.Items.FindByValue("Y").Tostring();

It works.

answered Aug 1, 2011 at 9:44

pinki

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Brian Kintz · Accepted Answer · 2011-07-01 07:12:41Z

0

SelectedValue will only work when using data binding. If you filled out the list manually via the Windows Forms Designer in Visual Studio or by manipulating the DropDownList.Items collection, you need to use SelectedItem as below:

DropDownList1.SelectedItem = "Y";

answered Jul 1, 2011 at 7:12

Brian Kintz

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