ListBox Items Increase When Postback?

Jan 27, 2010

I made a web part use ASP.NET. There are a listbox and two buttons on it. When you click the Button A, it would add a new item into the listbox.When clicking the Button B, it would postback the list items data. But when you click the button B, the number of listbox number becomes twice.

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[Code].....

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[Code]....

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[URL]

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[Code]....

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