Introduction AJAX (Asynchronous JavaScript and XML) is a new web development technique used for interactive websites. AJAX can help us develop web applications and retrieve small amounts of data from a web server. AJAX is a different type of technology.
Step 3 : Go to Default.aspx page and click on the [Design] option and drag the control from the Toolbox.
<asp:BalloonPopupExtender ID="BalloonPopupExtender1" TargetControlID="TextBox1" BalloonPopupControlID="Panel1" BalloonSize="Medium" BalloonStyle ="Rectangle" UseShadow="true"runat="server"> </asp:BalloonPopupExtender>Step 7 : Now run the application by pressing F5.
Step 8 : If we change the BalloonStyle property to "Cloud" then show following shape.
Step 9 : The BalloonStyle property could be also define the "Custom" property, which means that we will have a CSS class where we will put our definitions of the look of the BalloonPopupExtender.
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