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POSharepoint problem saving a file over an existing file in a document library
 

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    <p>I have an existing document in a document library and I'm trying to overwrite that file in code using code like this:</p> <pre><code>byte[] data = ... SPListItem li = ... li.File.SaveBinary(data); </code></pre> <p>When I run this code I get:</p> <pre><code>Microsoft.SharePoint.SPException: The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again. ---&gt; System.Runtime.InteropServices.COMException (0x8102006D): The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again. at Microsoft.SharePoint.Library.SPRequestInternalClass.PutFile(String bstrUrl, String bstrWebRelativeUrl, Object varFile, PutFileOpt PutFileOpt, String bstrCreatedBy, String bstrModifiedBy, Int32 iCreatedByID, Int32 iModifiedByID, Object varTimeCreated, Object varTimeLastModified, Object varProperties, String bstrCheckinComment, UInt32&amp; pdwVirusCheckStatus, String&amp; pVirusCheckMessage) at Microsoft.SharePoint.Library.SPRequest.PutFile(String bstrUrl, String bstrWebRelativeUrl, Object varFile, PutFileOpt PutFileOpt, String bstrCreatedBy, String bstrModifiedBy, Int32 iCreatedByID, Int32 iModifiedByID, Object varTimeCreated, Object varTimeLastModified, Object varProperties, String bstrCheckinComment, UInt32&amp; pdwVirusCheckStatus, String&amp; pVirusCheckMessage) --- End of inner exception stack trace --- at Microsoft.SharePoint.Library.SPRequest.PutFile(String bstrUrl, String bstrWebRelativeUrl, Object varFile, PutFileOpt PutFileOpt, String bstrCreatedBy, String bstrModifiedBy, Int32 iCreatedByID, Int32 iModifiedByID, Object varTimeCreated, Object varTimeLastModified, Object varProperties, String bstrCheckinComment, UInt32&amp; pdwVirusCheckStatus, String&amp; pVirusCheckMessage) at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file, String checkInComment, Boolean checkRequiredFields, Boolean bIsMigrate, Boolean bIsPublish, SPUser modifiedBy, DateTime timeLastModified, SPVirusCheckStatus&amp; virusCheckStatus, String&amp; virusCheckMessage) at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file, Boolean checkRequiredFields, Boolean bIsMigrate, Boolean bIsPublish, SPUser modifiedBy, DateTime timeLastModified) at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file, Boolean checkRequiredFields) at Microsoft.SharePoint.SPFile.SaveBinary(Byte[] file) at TestClass.UploadFile() </code></pre> <p>I'm running this code on a form hosted in the same site as sharepoint and the user that is running the code can upload the file manually just fine. Do I need to delete the file first? Check it out?</p>
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