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<
asp:ScriptManager
runat
=
"server"
>
</
script
type
"text/javascript"
function Validating(sender, args)
{
if (args.get_input().get_value() == " ")
args.set_isValid(false);
args.set_cancel(true);
}
telerik:RadInputManager
ID
"RadInputManager1"
telerik:TextBoxSetting
BehaviorID
"TextBoxSetting1"
Validation-IsRequired
"true"
ClientEvents-OnValidating
"Validating"
TargetControls
telerik:TargetInput
ControlID
"TextBox1"
/>
asp:TextBox