CheckAllCheck
The CheckAllCheck event occurs when the check all items check box of the RadComboBox is changed.
The CheckAllCheck event does not fire unless the AutoPostBack property is True .
The CheckAllCheck receives one argument which indicates whether the check all check box is checked or unchecked.
<telerik:RadComboBox RenderMode="Lightweight" ID="RadComboBox1" runat="server" OnCheckAllCheck="RadComboBox1_CheckAllCheck"
EnableCheckAllItemsCheckBox="true" AutoPostBack="true" CheckBoxes="true">
<Items>
<telerik:RadComboBoxItem Text="Item1" />
<telerik:RadComboBoxItem Text="Item2" />
<telerik:RadComboBoxItem Text="Item3" />
</Items>
</telerik:RadComboBox>
<asp:Label ID="Label1" runat="server" />
protected void RadComboBox1_CheckAllCheck(object sender, RadComboBoxCheckAllCheckEventArgs e)
{
bool allChecked = e.CheckAllChecked;
if (allChecked)
{
Label1.Text = "All items are checked.";
}
else
{
Label1.Text = "All items are unchecked";
}
}
Protected Sub RadComboBox1_CheckAllCheck(sender As Object, e As RadComboBoxCheckAllCheckEventArgs)
Dim allChecked As Boolean = e.CheckAllChecked
If allChecked Then
Label1.Text = "All items are checked."
Else
Label1.Text = "All items are unchecked"
End If
End Sub