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How can I make a Textbox a mandatory field if a checkbox is checked on a button click event in the client side?

Platform: ASP.NET| Category: Client Side Scripting

<asp:TextBox id='TextBox1' style='Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 104px' runat='server'></asp:TextBox>
<asp:CheckBox id='CheckBox1' style='Z-INDEX: 102; LEFT: 24px; POSITION: absolute; TOP: 80px' runat='server'></asp:CheckBox>
<asp:Button id='Button1' style='Z-INDEX: 103; LEFT: 32px; POSITION: absolute; TOP: 144px' runat='server' Text='Button'></asp:Button>

function func1()
	 if(document.getElementById ('CheckBox1').checked == true) 
 		if(document.getElementById('TextBox1').value == '') 
			alert('Enter something in textbox');


Button1.Attributes.Add ('onclick' , 'return func1()');


Button1.Attributes.Add ('onclick' , 'return func1()'); 

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