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<%@ Page Language="C#" %>
<html>
<script runat=server>
protected void Page_Load(object src, EventArgs e)
{
if (IsPostBack)
{
int op1 = int.Parse(_op.Value);
int op2 = int.Parse(_sum.InnerText);
_sum.InnerText = (op1+op2).ToString();
}
}
</script>
<body>
<form runat=server>
<h2>ASP.NET accumulator page</h2>
<input size=2 type=text id=_op runat=server/>
Sum:<span id=_sum runat=server>0</span>
<p>
<input type=submit value="Add" />
</p>
</form>
</body>
</html>
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