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pawar_deepakFlag for United States of America asked on

How to remove repeating items from DropDown?

Hello,

I am adding items to dropdown on Page Load.

if (system == "aaa")
            {
                ddlSystem.Items.Add("");
                ddlSystem.Items.Add("aa");
                ddlSystem.Items.Add("bb");              
            }

else if (system == "xxx")
            {
                ddlSystem.Items.Add("");
                ddlSystem.Items.Add("xx");
                ddlSystem.Items.Add("yy");              
            }

On postback, the dropdown shows repeating values like

aa
bb
aa
bb

instead of just
aa
bb

Each time there is a postback, dropdown gets a new set of repeating items. How can I make dropdown to show only aa, bb and not the repeating set of items?

C#ASP.NET

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Last Comment
pawar_deepak

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Kaushal Arora

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SOLUTION
kaufmed

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BuggyCoder

well i would rather create a function called AddItem(DropDownList ddl, string item, string value)
{
if(!ddl.items.contains(item)
{
ddl.items.add(item,value)
}
}

this is removes lot of repetative coding
ASKER
pawar_deepak

I tried using ddlSystem.Items.Clear(); before but it didn't work cause I was using it on page load.

I wrote ddlSystem.Items.Clear(); under  If(!IsPostBack) and it works perfectly.

if(!IsPostBack)
{
if (system == "aaa")
            {
                ddlSystem.Items.Add("");
                ddlSystem.Items.Add("aa");
                ddlSystem.Items.Add("bb");              
            }

else if (system == "xxx")
            {
                ddlSystem.Items.Add("");
                ddlSystem.Items.Add("xx");
                ddlSystem.Items.Add("yy");              
            }
}




Thank you.
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