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<% @Page Language="C#" %>
<!-- code section -->
<script runat="server">
private void test1(object sender, EventArgs e)
{
float a;
string b = input1.Value;
if (!float.TryParse(b, out a))
changed_text.InnerHtml = "invalid number try it again!";
else
changed_text.InnerHtml = "valid number!";
} 
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<label>Type a number:</label>
<input runat="server" id="input1" type="text"/>
<input runat="server" id="button1" type="submit" value="Click" OnServerClick="test1"/>
<hr />
<h3> Results: </h3>
<span runat="server" id="changed_text" />
</form>
</body>
</html> 
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