C # Written by WinForm program binding ComboBox successfully, add a default text option "Please select"

Dangdang 9 Anniversary of the celebration, special, free shipping, come grab it.

1. Bind comboBox1 from database tables, this use dataset can be, not much said, estimated.

2. Fill in the following code

In the following Drop-down list box, insert the "select"
DataTable table = (DataTable) ComboBox1.   DataSource; Assign a data source to a table
DataRow dr = table. NewRow ();
Dr[0] = "0";
DR[1] = "Please choose";
Table. Rows.insertat (DR, 0);

Combobox1.datasource = table; ComboBox1 's data source is table
Combobox1.selectedindex = 0; The default display "Please select"