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Security Validation error in sharepoint

 While creating one of the sites from the browser i came an error saying The security validation for this page is invalid. Click Back in your Webbrowser, refresh the page, and try your operation again
I got bit confused as i didn’t know where to find and sort it out so i checked few sections in central admin site found one place. You can check for this :

  • Navigate thru the following Central Administration Site->application management->web application settings->”turn security validation off”

If above is ok then you may also check out below alternate

  • The Windows SharePoint Services Web site is configured to use Anonymous Access in addition to another method of authentication, such as Basic Authentication. Turn off the Basic Authentication from ISS->your sharepoint site-> right click properties->Directory Security tab
  • The last alternate is if you need code fix
using (SPSite site = new SPSite(parentSiteUrl))
site.AllowUnsafeUpdates = true;       
using (SPWeb web = site.OpenWeb())       
web.AllowUnsafeUpdates = true;           
SPList list = web.Lists[“mylist”];           
_listItem = clientsList.Items.Add();           
_listItem[“Title”] = “test”;           
One of the above alternate should help you out
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