CODEWITHSUNDEEP
c#asp.net
Selva
Selva

Reputation: 471

How to check if an item exists in the checkboxlist before adding an item to the checkboxlist?

I have a checkboxlist and i am getting duplicate list items in the checkboxlist. I want to check if the particular item is exist in the checkboxlist before add an item. what is the optimized way to do this check?

<asp:CheckBoxList runat="server" ID="chkboxlist"  CellPadding="5" CellSpacing="5" />

   chkboxlist.Items.Add("GEORGIA");
   chkboxlist.Items.Add("OHIO");

Before adding any state to the checkbox list , i want to check the state value is already exist in the checbox list. How to do that?

Upvotes: 0

Views: 4517

Answers (2)

Fabio
Fabio

Reputation: 1980

You can use FindByValue method of the Items property for check if a value exists. If value not exists the method return null.

By code

If(checkboxlist.Items.FindByValue("yourvalue") !=null)
    {
         // Exists
    }

Upvotes: 1

Habib
Habib

Reputation: 223292

You can use LINQ's Enumerable.Any like 

string newItem = "OHIO";
if (chkboxlist.Items.Cast<ListItem>().Any(r => r.Text == newItem))
{
    //Already exists
}
else
{
    chkboxlist.Items.Add(newItem);
}

If you want case insensitive comparison then you can do:

if (chkboxlist.Items.Cast<ListItem>()
      .Any(r => String.Equals(r.Text,newItem, StringComparison.InvariantCultureIgnoreCase)))

Upvotes: 1

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