First see the Dropdownlist
<asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="True">
<asp:ListItem>--Select--</asp:ListItem>
<asp:ListItem>Pen</asp:ListItem>
<asp:ListItem>Pencil</asp:ListItem>
<asp:ListItem>Rubber</asp:ListItem>
</asp:DropDownList>
Then for validate see the requiredfield validator
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="DropDownList1"
ErrorMessage="Value Required!" InitialValue="--Select--"></asp:RequiredFieldValidator>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
We need to set InitialValue property of the RequiredFieldValidator with the InitialValue of the DropDownList to make it work
asp.net dropdownlist validation using Required Field Validation
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nore mosratiPosted Aug 22, 2017, 5:00 AM
Hi it's work thanks very good
vikas vyasPosted Aug 1, 2014, 2:14 AM
<asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="True"> <asp:ListItem value="0" >--Select--</asp:ListItem> <asp:ListItem>Pen</asp:ListItem> <asp:ListItem>Pencil</asp:ListItem> <asp:ListItem>Rubber</asp:ListItem> </asp:DropDownList> in the required field in initial value you should write "0"