How To: Open a pop-up window using dropdownlist
To open pop-up window using <asp:dropdownlist..> VB.NET Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Response.Write("<script>window.open('" + DropDownList1.SelectedValue + "'
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Read the complete post at http://weblogs.asp.net/sushilasb/archive/2006/08/02/How-to-open-a-pop_2D00_up-window-using-dropdownlist-.aspx