Specifying a Default Button : Form « HTML Controls « ASP.NET Tutorial
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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnSearch_Click(object sender, EventArgs e)
{
lblResult.Text = "Search for: " + txtSearch.Text;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Button Default Button</title>
</head>
<body>
<form id="form1" defaultbutton="btnSearch" runat="server">
<div>
<asp:Label
id="lblSearch"
Text="Search:"
AssociatedControlID="txtSearch"
Runat="server" />
<asp:TextBox
id="txtSearch"
Runat="server" />
<asp:Button
id="btnSearch"
Text="Search"
OnClick="btnSearch_Click"
Runat="server" />
<asp:Button
id="btnCancel"
Text="Cancel"
Runat="server" />
<hr />
<asp:Label
id="lblResult"
Runat="server" />
</div>
</form>
</body>
</html>