You can add a default “Select” option in a drop down list by two ways:
1. Before loading the drop down list with data.
2. After loading the drop down with data.
In first case you can do it as mentioned below:
DropDownList1.AppendDataBoundItems = true;
DropDownList1.Items.Add(new ListItem(“Select”, “-1”));
//Bind Your DropDownList here with data from database
For second case you can bind it as mentioned below:
//Bind Your DropDownList here with data from database
DropDownList1.Items.Insert(0, new ListItem(“Select”, “-1”));
Happy Coding 🙂