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I am using Update panel in my custom webpart. I need to show the default sharepoint 2010 Loading message when user click on button and postback event fires.

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If you are looking to use the SP.UI.Notify (, take a look at

Greetz, Bram

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Sounds like you are looking for the SPLongOperation. Please have a look here for instance:

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you can use updateprogress control inside updatepanel with default waiting html content for SharePoint. Please see the link for details -

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You should use SP.UI.Notify.showLoadingNotification()

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