https://community.blueprism.com/t5/Product-Forum/Unable-to-use-DataTable-in-code-block/m-p/77304#M29567 Remove the System.dll reference, and add C:\Windows\Microsoft.NET\Framework64\v2.0.50727\system.dll (also full path) instead. Seems like Blue Prism requires full path to System.dll file. Ref: <A href="https://blueprism.knowledgeowl.com/help/how-do-i-use-c-code-in-blue-pri" target="test_blank">https://blueprism.knowledgeowl.com/help/how-do-i-use-c-code-in-blue-pri</A> Wed, 07 Dec 2016 17:04:00 GMT shahariar_k_bhu 2016-12-07T17:04:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-use-DataTable-in-code-block/m-p/77303#M29566 If I use a datatable (DataTable dt = new DataTable())in the code block, I'm getting the following error.(Language preference is set to c#) System.ComponentModel.MarshalByValueComponent is in a assembly that is not referenced. System.ComponentModel.IListSource is in a assembly that is not referenced. System.ComponentModel.ISupportIniatializeNotification is in a assembly that is not referenced. These namespaces are by default included in System.dll which is included by default. If try to add an external reference. It says kindly remove the duplicate reference. Wed, 07 Dec 2016 15:23:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-use-DataTable-in-code-block/m-p/77303#M29566 vignesh_sundar 2016-12-07T15:23:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-use-DataTable-in-code-block/m-p/77304#M29567 Remove the System.dll reference, and add C:\Windows\Microsoft.NET\Framework64\v2.0.50727\system.dll (also full path) instead. Seems like Blue Prism requires full path to System.dll file. Ref: <A href="https://blueprism.knowledgeowl.com/help/how-do-i-use-c-code-in-blue-pri" target="test_blank">https://blueprism.knowledgeowl.com/help/how-do-i-use-c-code-in-blue-pri</A> Wed, 07 Dec 2016 17:04:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-use-DataTable-in-code-block/m-p/77304#M29567 shahariar_k_bhu 2016-12-07T17:04:00Z