How to set selected item in multiple dropdown dynamically in asp.net

We can set selected item in multiple dropdown list by using two methods.

1. FindByText

2. FindByValue

FindByText : 

In FindByText method search item by text and set selected.

dorpdownId.Items.FindByText("Some Text").Selected = true;

FindByValue : 

In FindByValue method search item by value and set selected.

dorpdownId.Items.FindByValue("your value").Selected = true;