How do I check whether an item exists in Listbox in asp.net?

Question

How do I check whether an item already exists in a Listbox?
I am using VS 2008 ASP.NET 3.5 framework C#. I used the following code...

 if (ListBox1.Items.Contains(drp_branch.SelectedItem.Value + "-" + txt_acc_no.Text))
 {...}

Solution 1

Try this...

string toMatch = drp_branch.SelectedItem.Value + "-" + txt_acc_no.Text;
ListItem item = ListBox1.Items.FindByText(toMatch);
if (item != null)
{
    //found
}
else
{
    //not found
}

Solution 2

you can use this for checking if item is exsits in list box or not ...

string checkitem = drp_branch.SelectedItem.Value + "-" + txt_acc_no.Text;

if ((ListBox1.Items.Contains(checkitem) == true))
{
   Response.Write("Item exists");
}
else
{
   Response.Write("Item not   exists");

}