C# - Combobox First Values Should Be Null?

Aug 2, 2010

Using Combobox in my webpage, in a combobox i want to display a null values first, then it should display all values..

Combobox.item = null values
combobox.item = 1
Combobox.item = 2
cmd = new OdbcCommand("Select vehicleno as vehicleno from tb_car", con);
ada = new OdbcDataAdapter(cmd);
cmbvnoview.DataValueField = "vehicleno";
cmbvnoview.DataSource = data1;

Above code is working, but is displaying all the values, first it should display a null value, then it should display all the values.

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