how to generate popup click on submit button in asp.net

Question

Hi Frnds

I have a page with registration form.when i submit the data it is showing succesfully and it save in data base .

now i want when i click on submit button i want popup with message successfully.

i am using application with asp.net .

 

 

this is my button 

 

asp:Button ID="btnSubmit" runat="server" Text="Generate" ValidationGroup="Diary" CssClass="btn btn-primary"

OnClick="btnSubmit_Click" ToolTip="Click To Save" />