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Clear RadComboBox

This article explains how to reset / clear RadComboBox.

Resetting the combobox depends on the AllowCustomText property - if it is set to True then you can clear the combo by calling its ClearSelection() server method and resetting its Text to an empty string:


<asp:ScriptManager ID="RadScriptManager1" runat="server"></asp:ScriptManager>
<telerik:RadComboBox ID="RadComboBox1" MaxHeight="200px" AllowCustomText="true" runat="server" EmptyMessage="-- Select Office Location --" >
    <Items>
        <telerik:RadComboBoxItem Text="Item1" Value="Item1" />
        <telerik:RadComboBoxItem Text="Item2" Value="Item2" />
        <telerik:RadComboBoxItem Text="Item3" Value="Item3" />
    </Items>
</telerik:RadComboBox>
<telerik:RadButton runat="server" ID="RadButton1" Text="Clear Selection" AutoPostBack="true" OnClick="RadButton1_Click" />


protected void RadButton1_Click(object sender, EventArgs e)
{
    RadComboBox1.ClearSelection();
    RadComboBox1.Text = String.Empty;
}


Protected Sub RadButton1_Click(ByVal sender As Object, ByVal e As EventArgs)
    RadComboBox1.ClearSelection()
    RadComboBox1.Text = String.Empty
End Sub

When AllowCustomText is false (its default value) and the EmptyMessage is set, the above code sample will work as expected too.

If AllowCustomText is false and if the EmptyMessage is not set then the combo will always have one selected item. What you can do here is to select the first item (it can be the item holding the "Select a product" text for example)


RadComboBox1.Items[0].Selected = true;


RadComboBox1.Items(0).Selected = True

When the RadComboBox checkBoxes are enabled, the method that you can use to clear the "selection" is named ClearCheckedItems() instead of ClearSelection().


RadComboBox1.ClearCheckedItems();


RadComboBox1.ClearCheckedItems()

Additionally, you can clear the items by using clearItems() client-side method or RadComboBox1.Items.Clear() server side method. Again, if the combobox's AllowCustomText is True then you need to manually set the Text of the RadComboBox to string.Empty.

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