i am using update panel . a textbox is inside the update panel , still page is refreshed when text of textbox is chaned .
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<br />
<table width="70%" cellpadding="5" cellspacing="10">
<tr>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<td style="width: 70px;">
Name
</td>
<td>
<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" OnTextChanged="chkName"></asp:TextBox>
...
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