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Web Part Property Storage Size Limits

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For performance and security reasons, the amount of storage that a property can consume in the Microsoft® Windows® SharePoint™ Services database is limited. The default storage size for properties with a storage type of Shared or Personal is 1 MB. However, you can modify this limit in the web.config file using the WebPartLimits setting.

<SharePoint>
      <WebPartLimits PropertySize="1048576"/>
      </SharePoint>

If the property exceeds this storage limit, the property values are not saved and an exception is raised.

For more information about property storage types, see Web Part Storage.