I dont know what happen but all of a sudden my web app keeps getting the following error when I click the button event in my code beloew. any ideas ?
page 1 code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtTo" runat="server"/>
<asp:Button ID="sendEmailBtn" runat="server" Text="Send Email" OnClick="sendEmailBtn_Click"/><asp:Label ID="lblMessage" runat="server"/>
</div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<br />
<br />
<as ...
Go to the complete details ...