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<% @Page Language="C#" %>
<!-- code section -->
<script runat="server">
private void test1(object sender, EventArgs e)
{
string text = "Hello world!";
text = text.ToLower();
int i = 0;
string char1 = "o";
string char2 = "";
foreach (char c in text)
{
if (char1.Contains(c))
i++;
}
char2 = i.ToString();
changed_text.InnerHtml = char2; 
}
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<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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