Hi
Put all your controls in an ajax update panel and try it..
sample code:
<asp:UpdatePanel ID="up" runat="server">
<ContentTemplate>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:GridView ID="showinfogrid" runat="server" AutoGenerateColumns="False" Width="100%">
<Columns>
<asp:BoundField DataField="Name" HeaderText="Employee_Name" ReadOnly="true" />
<asp:BoundField DataField="Employee_ID" HeaderText="Emp_ID" ReadOnly="true" />
<asp:BoundField DataField="Department" HeaderText="Department" ReadOnly="true" />
<asp:BoundField DataField="Designation" HeaderText="Designation" ReadOnly="true" />
</Columns>
</asp:GridView>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>