Web Forms :: Particular Country Get Marked If Selected From Dropdownlist

Jan 3, 2010

learning asp.net and prepare my final year project. i've problem in dropdownlist hope i found answer here. I've two dropdown list each consist four listitem as follows

dropdownlist1
uk,usa,india,singapore.

dropdownlist2
uk,usa,india,singapore.

if anyone of the country selected from dropdownlist1 then dropdownlist2 that particular country automatically get masked or readomly

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.
.
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My problem is I need to set selected value of a drop down list to a value I retreive from a database. The example only has a know value.


Below is the HTML and Code.
<asp:DropDownList
id="ddlCatogory1st1"
DataSourceID="srcCatogory1st1"
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AutoPostBack="true"
Runat="server" />
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When I run this page I get

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 222:
Line 223: Sub DISPLAY_CATEGORY()
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drpdwncity.SelectedItem.Text = READER("CITY").ToString.Trim

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