Hi All, We have a custom settings page called XYZ.aspx. it works fine on web application A, but it doesn't work on web application B. This is the error message on B: "The type specified in the TypeName property of ObjectDataSource 'TransversalFunctionDataSource' could not be found. " I've tried copying the web.config file from A to B, but it doesn't work. Sorry, I'm not a developer so please be specific when giving tips. Any help would be much appreciated. Thanks. TiffBlueVivian Tran

Hi tiffblue, For this issue, you need to add reference to the assembly in web.config like this(where MyAssemblyName is the name of the assembly of your Web Part): <system.web> <compilation> <assemblies> <add assembly="MyAssemblyName, Version=XYZ, Culture=neutral, PublicKeyToken=XYZ" /> </assemblies> </compilation> </system.web> For more reference, you can go through this article: http://insomniacgeek.com/how-to-fix-the-the-type-specified-in-the-typename-property-of-objectdatasource-could-not-be-found-error-in-a-sharepoint-custom-solution/ Thanks & Regards, Peng Lei

Thank you Peng for your help! I had put my assembly in the SafeControl section in Web.config, and in the <assemlbies> list of the <compiliaton> section but its not not working. Any ideas what I need to check on next? Thanks, Tiffblue Vivian Tran