Validation of drop-down lists

How can I validate whether a TextBox is empty when a Dropdown list's selected index changes in ASP.NET using validation controls?

Answer №1

I am optimistic that this solution will function effectively.

    <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
    <asp:DropDownList ID="ddlOptions" runat="server" CausesValidation="true" AutoPostBack="true">
    </asp:DropDownList>
    <asp:RequiredFieldValidator ID="rfvName" ControlToValidate="txtName" runat="server" ErrorMessage="Please Enter a Value"></asp:RequiredFieldValidator>

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