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Editorial Team
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Asked: 2026-05-21T16:07:18+00:00

I am using Ajax AsyncFileUpload control in asp.net 4.0 with master page and I

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I am using Ajax AsyncFileUpload control in asp.net 4.0 with master page and I get error that file is invalid. If I use it without master page, it works. With master page If I set 

ClientIDMode="AutoID"

It start working. What is purpose of ClientIDMode and why AsyncFileupload is not working without ClientMode with master page.

Please suggest.

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1 Answer

  1. Editorial Team

    The ClientID value is generated by concatenating the ID values of each parent naming container with the ID value of the control. In data-binding scenarios where multiple instances of a control are rendered, an incrementing value is inserted in front of the control’s ID value. Each segment is separated by an underscore character (_). This algorithm was used in versions of ASP.NET earlier than ASP.NET 4.

    From MSDN

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