Simple Code :- <asp:Button ID="btn" runat="server" Text="Start" UseSubmitBehavior="false" OnClientClick="this.disabled=true; this.value = 'Please wait ...';" onclick="btn_Click" /> With Confirm Message : <asp:Button ID="btn" runat="server" Text="Start" UseSubmitBehavior="false" OnClientClick="if (!confirm('Certain??')) return; this.disabled=true;this.value = 'Please wait ...';" onclick="btn_Click" />
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