try like this.
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="jquery-1.10.2.js" type="text/javascript"></script>
<script type="text/javascript">
var Enable = function (grid) {
for (var i = 0; i < grid.rows.length; i++) {
grid.rows[i].disabled = false;
}
}
var Disable = function (grid) {
for (var i = 0; i < grid.rows.length; i++) {
grid.rows[i].disabled = true;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl" runat="server" Text="some"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:TextBox ID="txt" runat="server" Text="some"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<asp:Button ID="btnEnableRows" Text="Enable" runat="server" OnClientClick="Enable(GridView1); return false" />
<asp:Button ID="Button1" Text="Disable" runat="server" OnClientClick="Disable(GridView1); return false" />
</form>
</body>
</html>
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