Remove duplicate values in DropDownList

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Hi,

In my ddlist I am adding duplicate items. I want all the items to be distinct in the ddlist box.

I tried

C#

if(!DropDownList1.Items.Contains(str))
{
    DropDoqnList1.Items.Add(str);
}

But it's showing me error like only 'ListItem' can pass as an argument.

Please help.

Posted 9-Oct-13 22:05pm

srmohanr

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3 solutions

Solution 2

Hello ,
there are two methods for searching the text or value in dropdown.
one is

FindByText

// search in  the collection which contains  the specified text

and another one is

FindByValue

// search in the collection which contains  the specified value

syntax is

drpdown.Items.FindByText(string text);

or

drpdown.Items.FindByValue(string value);

and then put it in the condition

 if (drpcategory.Items.Contains(drpcategory.Items.FindByText("search text")))
{
  //code..
}

thanks

Posted 9-Oct-13 22:14pm

Animesh Datta

Updated 9-Oct-13 22:31pm

v3

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Zafar Sultan · Accepted Answer · 2013-10-09T22:08:00

Solution 1

Try:

C#

if(!DropDownList1.Items.Contains(new ListItem(str)))
{
ListItem li = new ListItem();
li.Text = str;
li.Value = str;
DropDoqnList1.Items.Add(li);
}

Posted 9-Oct-13 22:08pm

Zafar Sultan

Updated 9-Oct-13 22:13pm

v2

Chintan Desai1988 · Accepted Answer · 2013-10-09T23:01:00

Solution 3

It's so simple just write this code to reduce duplicate value.

C#

if(!DropDownList1.Items.Contains(new ListItem(data)))
        {
            DropDownList1.Items.Add(data);
        }

thanx.....:-)

Posted 9-Oct-13 23:01pm

Chintan Desai1988

Comments

srmohanr 10-Oct-13 5:47am

Thanks for your help :)

Chintan Desai1988 10-Oct-13 6:07am

you welcome dear........:-)

Member 11529058 18-Mar-15 3:42am

where to put this statement?