In below code when i am selecting a value from dropdown list after postback the dropdown list select first value of list but not the actual selected value. so please help me.
<td>
<asp:DropDownList CssClass="form-control dropdown" ID="ddl_nprice" runat="server"
DataSourceID="SqlDataSource4" DataTextField="nozzle_price" DataValueField="company_email"
AutoPostBack="true">
</asp:DropDownList>
<asp:SqlDataSource runat="server" ID="SqlDataSource4" ConnectionString='<%$ ConnectionStrings:Mycon %>'
SelectCommand="SELECT [company_email], [nozzle_lph], [nozzle_price] FROM [company_sprinkler_data] WHERE (([company_email] = @company_email) AND ([nozzle_lph] != @nozzle_lph) AND ([nozzle_price] != @nozzle_price))">
<SelectParameters>
<asp:ControlParameter ControlID="ddl_comp" PropertyName="SelectedValue" Name="company_email"
Type="String"></asp:ControlParameter>
<asp:Parameter DefaultValue="0" Name="nozzle_lph" Type="Int32"></asp:Parameter>
<asp:Parameter DefaultValue="0" Name="nozzle_price" Type="Double"></asp:Parameter>
</SelectParameters>
</asp:SqlDataSource>
</td>
