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<script runat="server">
public void check_operator (object sender, EventArgs e) {
compval.Operator = (ValidationCompareOperator)list.SelectedIndex;
compval.Validate();
}
</script>
<html>
<body>
<form runat="server">
<table border="0" bgcolor="#b0c4de">
<tr valign="top">
<td colspan="4"><h4>Compare two values</h4></td>
</tr>
<tr valign="top">
<td><asp:TextBox id="txt1" runat="server" /></td>
<td>
<asp:ListBox id="list" rows="2" OnSelectedIndexChanged="check_operator" runat="server">
<asp:ListItem value="Equal" selected>=</asp:ListItem>
<asp:ListItem value="NotEqual"><></asp:ListItem>
</asp:ListBox>
</td>
<td><asp:TextBox id="txt2" runat="server" /></td>
<td><asp:Button Text="Validate" runat="server" /></td>
</tr>
</table>
<br />
<asp:CompareValidator
id="compval"
Display="dynamic"
ControlToValidate="txt1"
ControlToCompare="txt2"
ForeColor="red"
BackColor="yellow"
Type="String"
EnableClientScript="false"
Text="Validation Failed!"
runat="server" />
</form>
</body>
</html>
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