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onpropertychange  only ie/

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function clearobj(obj)
{
  document.getElementById(obj).value="";
}
function clearobj2(obj1,obj2,obj3)
{
  document.getElementById(obj1).value="";
  document.getElementById(obj2).value="";
  document.getElementById(obj3).value="";
}

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TextBox2.Attribute.Add("onchange","clearobj('TextBox1')");
TextBox3.Attribute.Add("onchange","clearobj('TextBox1')");
TextBox4.Attribute.Add("onchange","clearobj('TextBox1')");

<asp:TextBox onchange="µ÷Óú¯Êý"/>

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