[C#] 
<%@ Page Language="C#" AutoEventWireup="True" %>
<html> <head> <script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e) {
TextBox1.Attributes["onblur"]="javascript:alert('Hello! Focus lost from text box!!');"; 
}
</script> </head> <body> <h3>Attributes Property of a Web Control</h3> <form runat="server"> <asp:TextBox id="TextBox1" columns=54 Text="Click here and then tap out of this text box" runat="server"/> </form> </body> </html> [JScript] <%@ Page Language="JScript" AutoEventWireup="True" %> <html> <head> <script language="JSCRIPT" runat="server"> function Page_Load(sender : Object, e : EventArgs){ TextBox1.Attributes("onblur") = "javascript:alert('Focus lost from text box!!');" } </script> </head> <body> <h3>Attributes Property of a Web Control</h3> <form runat="server"> <asp:TextBox id="TextBox1" columns=54 Text="Click here and then tab out of this text box" runat="server"/> </form> </body> </html>
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