[c#] Selecting default item from Combobox C#

I have few items on my ComboBox items collection, and i'd like to select one item from this list and set it as default item - when app starts - this item is already on comboBox.

I'm trying something like that:

SelectPrint11.SelectedIndex=2;

but error is:

System.ArgumentOutOfRangeException: InvalidArgument=Value of '2' is not valid for 'SelectedIndex'

Edit:

In mylist are 3 items, Printer1, Printer2, Printer3. All are added in ComboBox Properties -> Items -> Collection

first, go to the form load where your comboBox is located,

then try this code

comboBox1.SelectedValue = 0; //shows the 1st item in your collection

this is the correct form:

comboBox1.Text = comboBox1.Items[0].ToString();

U r welcome

Remember that collections in C# are zero-based (in other words, the first item in a collection is at position zero). If you have two items in your list, and you want to select the last item, use SelectedIndex = 1.

    ComboBox1.Text = ComboBox1.Items(0).ToString

This code is show you Combobox1 first item in Vb.net

private void comboBox_Loaded(object sender, RoutedEventArgs e)
{
 Combobox.selectedIndex= your index;
}

OR if you want to display some value after comparing into combobox

 foreach (var item in comboBox.Items)
            {
                if (item.ToString().ToLower().Equals("your item in lower"))
                {
                    comboBox.SelectedValue = item;
                }
            }

I hope it will help, it works for me.

This means that your selectedindex is out of the range of the array of items in the combobox. The array of items in your combo box is zero-based, so if you have 2 items, it's item 0 and item 1.