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How to Configure in web.config to Upload Large File in ASP.NET

you need to increase the size of allow content length. Try add this in web.config (in bytes):

  1. <system.webServer>  
  2.     <security>  
  3.         <requestFiltering>  
  4.             <requestLimits maxAllowedContentLength="1073741824" />   
  5.          /requestFiltering>  
  6.     </security>  
  7. </system.webServer>