How to use ASP.NET requiredfieldvalidator in autocomplete control?

The ASP.NET RequiredFieldValidator control ensures that the corresponding field is not left empty on Form submission. It is generally tied to a text box to force input into the text box.

To use ASP.NET RequiredFieldValidator with Autocomplete control, set the ID of the Autocomplete as the value of the ControlToValidate property of the validator.

ASPX

 
<ej:Autocomplete ID="searchCustomer" runat="server" Width="100%" DataTextField="ComponentName" DataUniqueKeyField="ComponentId" WatermarkText="Search a customer"></ej:Autocomplete>
 
     <asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1" ControlToValidate="searchCustomer" ErrorMessage="Select an item" ></asp:RequiredFieldValidator>
 
    <asp:Button runat="server" ID="Button1" Text="Submit" OnClick="Button1_Click" /><br />
 
    <asp:Label runat="server" ID="Label1"></asp:Label>

ASPX.CS

 
protected void Page_Load(object sender, EventArgs e)
        {
            this.searchCustomer.DataSource = "http://mvc.syncfusion.com/UGOdataServices/Northwnd.svc/";
            this.searchCustomer.Query = "ej.Query().from('ComponentLists').select('ComponentId', 'ComponentName')";
 
        }
 
        protected void Button1_Click(object sender, EventArgs e)
        {
            Label1.Text = "Autocomplete controls validated";
        }

Note:

A new version of Essential Studio for ASP.NET is available. Versions prior to the release of Essential Studio 2014, Volume 2 will now be referred to as a classic versions.The new ASP.NET suite is powered by Essential Studio for JavaScript providing client-side rendering of HTML 5-JavaScript controls, offering better performance, and better support for touch interactivity. The new version includes all the features of the old version, so migration is easy.

The Classic controls can be used in existing projects; however, if you are starting a new project, we recommend using the latest version of Essential Studio for ASP.NET. Although Syncfusion will continue to support all Classic Versions, we are happy to assist you in migrating to the newest edition.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls. If you have any queries or require clarifications, please let us know in the comments section below.

You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!