I am creating function searching on my web with drop down list, text box and button search. The following code:

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true"
     <asp:ListItem Value="Pelanggan Rumah"></asp:ListItem>
     <asp:ListItem Value="Meter Besar"></asp:ListItem>
     <asp:ListItem Value="Kios Air"></asp:ListItem>
     <asp:ListItem Value="Pipa"></asp:ListItem>
     <asp:ListItem Value="Pembayaran"></asp:ListItem>
<asp:TextBox ID="CariText" runat="server" Width="100px" Height="23px" CssClass="text_boxt_search"></asp:TextBox>
<asp:Button ID="Find" runat="server" Text="Search" Width="61px" CssClass="style105"  Height="25px" />

And this is code behind:

Public Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
        Dim strConnect As String = Nothing
        strConnect = Session("Data Source=;Initial Catalog=ATBGISMAPDB;Persist Security Info=True;User ID=gis;Password=Pa5word@tb")

        Dim a As String = "SqlDataSourceCustomer" 'datasourceID'
        Dim b As String = "SqlDataSourceTank" 'datasourceID'
        Dim c As String = "SqlDataSourceKiosk" 'datasourceID'
        Dim d As String = "SqlDataSourcePipa" 'datasourceID'

        If DropDownList1.SelectedItem.Value = a Then
            Query = "SELECT * FROM DBCUSTOMER where a = '" & LabelDDL.Text & "'"
        ElseIf DropDownList1.SelectedItem.Value = b Then
            Query = "SELECT * FROM METER_MAIN where b = '" & LabelDDL.Text & "'"
        ElseIf DropDownList1.SelectedItem.Value = c Then
            Query = "SELECT * FROM KIOSK where c = '" & LabelDDL.Text & "'"
        ElseIf DropDownList1.SelectedItem.Value = d Then
            Query = "SELECT * FROM PIPELINE_NEW where d = '" & LabelDDL.Text & "'"
        End If
    End Sub

But, with above code the function not running yet. Can anyone help me?
'sorry for my english'

Can you plz explain what error are you getting while running the above code??

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