DropDownList SelectedIndexChanged event not resign

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VB

Hi.. i am using DropDownList it's have some ListItem But i am resign the event in text Changed or SelectedIndexChanged event it not resided what i done mi stack this is my code:UI

<asp:DropDownList ID="CallStatus" CssClass="droptownBox" runat="server">
                           <asp:ListItem>Open</asp:ListItem>
                           <asp:ListItem>Action Taken</asp:ListItem>
                           <asp:ListItem>Fixed</asp:ListItem>
                           <asp:ListItem>Closed</asp:ListItem>
                           <asp:ListItem>Reopen</asp:ListItem>
                           <asp:ListItem>Reject</asp:ListItem>
                           <asp:ListItem>Pending-Move Out Request</asp:ListItem>
                       </asp:DropDownList>

Protected Sub CallStatus_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles CallStatus.SelectedIndexChanged
        If CallStatus.Text = "Closed" Then
            PanelSoluationView.Visible = False
            Submit.Text = "Closed"
        End If
    End Sub