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I'm using 2 dropdownList.Error should fire when dropdown is select empty

What I have tried:

<asp:DropDownList ID="ddl1" runat="server">
<asp:ListItem Value="0">Select
<asp:ListItem Value="1">one
<asp:ListItem Value="2">
<asp:ListItem Value="3">two
<asp:ListItem Value="4">three

Second List item is blank When i click on it error message should get fier.
Blank data should not get save
Updated 5-Aug-16 3:41am

try this

<asp:Button runat="server" ID="btnSave" Text="Save" OnClientClick="return Validate();" OnClick="btnSave_Click" />

function Validate()
            var ddl1 = document.getElementById('<%= ddl1.ClientID %>');
            var ddl2 = document.getElementById('<%= ddl2.ClientID %>');
            if (ddl1.options[ddl1.selectedIndex].text == '' || ddl1.options[ddl1.selectedIndex].text == '')
                alert('Please enter the data');
                return false;
            return true;
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Ill probably do something along these lines



jquery Onclick()

//throw error
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