Dropdown problem validation

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ASP.NET

How to get the count in the dropdown values.
when I use

dropdownlist.items.count =0

then it is always showing the values.

see my code below.

If drpBrandName.Items.Count = 0 Then
                Else
                    Dim myscript As String = "alert('Select Brand Name');"
                    System.Web.UI.ScriptManager.RegisterClientScriptBlock(Me.Page, Me.GetType(), "myscript", myscript, True)
                    drpBrandName.Focus()
                    Exit Sub
                End If

please. help.

I want, if dropdown count is "Zero" then it should not validate otherwise, it should validate.

give me the solution.

Regards,
Ganesh.S