{"id":847,"date":"2017-09-12T20:00:00","date_gmt":"2017-09-13T03:00:00","guid":{"rendered":"https:\/\/ml2solutions.com\/?p=847"},"modified":"2021-05-02T17:08:50","modified_gmt":"2021-05-03T00:08:50","slug":"asp-net-dropdownlist-default-value-field-validation","status":"publish","type":"post","link":"https:\/\/ml2solutions.com\/websites\/asp-net-dropdownlist-default-value-field-validation\/","title":{"rendered":"ASP.NET DropDownList default value field validation"},"content":{"rendered":"

I needed to add a DropDownList to a ASP.NET form.  Unlike forms I had used before, I wanted to make sure a different value was selected other than the top one in the list.  So, the first solution I researched was to set a default value.  This was accomplished with the Selected=”True” attribute.<\/p>\n

The second condition I wanted to figure out was how to make sure something else besides the default value wasn\u2019t still selected.  That was handled using a RequiredFieldValidor and setting the InitialValue field.<\/p>\n

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<asp:DropDownList ID=”dropELLIPTICALCOMETScometname” runat=”server” Width=”270px” Height=”22px”>
\n     <asp:ListItem Value=”Select Comet” Selected=”True”>–Select Comet–<\/asp:ListItem>
\n     <asp:ListItem Value=”Encke”>Encke<\/asp:ListItem>
\n     <asp:ListItem Value=”Halley”>Halley<\/asp:ListItem>
\n<\/asp:DropDownList><\/p>\n

<asp:RequiredFieldValidator ID=”RequiredFieldValidator9″ runat=”server” ControlToValidate=”dropELLIPTICALCOMETScometname” CssClass=”ErrorMessage” Display=”Dynamic” ErrorMessage=”Select Comet Name” InitialValue=”Select Comet”><\/asp:RequiredFieldValidator><\/p>\n

References:<\/p>\n