we can make dropdown list in asp.net component with below syntax
<asp:DropDownList ID="test" runat="server">
<asp:ListItem Text="1" Value="1"></asp:ListItem>
</asp:DropDownList>
if we want our combo box contain 1 to 1000 , is there any way to populate it with foreach loop , rather than manually add 1000 item to it ?
Yes, you can add ListItems programmatically:
for(int i=1; i<=1000; i++)
{
ListItem item = new ListItem(i.ToString(), i.ToString());
test.Items.Add(item);
}
You could also use this linq query and use it as DataSource:
var source = Enumerable.Range(1, 1000)
.Select(i => new { Text= i.ToString(), Value=i.ToString() });
test.DataSource = source;
test.DataTextField = "Text";
test.DataValueField = "Value";
test.DataBind();
How about just binding the dropdown list directly to a collection of numbers?
IEnumerable<int> numbers = Enumerable.Range(1, 1000);
test.DataSource = numbers;
test.DataBind();
Sure, in your code-behind:
if (!Page.IsPostBack)
{
// Populate DropDownList
for (int i = 1; i < 1001; i++)
{
ListItem li = new ListItem(i.ToString(),i.ToString());
test.Items.Add(li);
}
}
for( int i=1;i<=100;i++)
{
ListItem li=new ListIem(i.ToString(),i.ToString());
test.Items.add(li);
}
Very basic code...
if(!Page.IsPostBack)
{
for (int i = 1; i <= 1000; i++)
{
test.Items.Add(new ListItem(i.ToString(), i.ToString()));
}
}
Here's some pseudocode:
for (int i = 0; i < 1000; i++)
{
ListItem item = new ListItem();
item.Text = i.ToString();
test.Items.Add(item);
}
You will have to find out exactly how to create the ListItem and populate it with a value.
