topic Thanks, I will try this out. in Product Forum https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85815#M36762 Thanks, I will try this out. Thu, 06 Oct 2016 12:36:00 GMT utkarsh_chauhan 2016-10-06T12:36:00Z Unable to add column to Data table using code stage https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85813#M36760 Hello Experts, I want to add a column to existing collection which I am receiving in object's action. To achieve this I have used a Code Stage(C#) which will take collection as input which is internally gets transformed into DataTable. After this I am adding code to insert new DataColumn. However when I compile this code I am receiving error related to DLL. But DLLs and namespace which are required as part of this code is already present. I have attached a word file describing my code and error. Note: I have also tried a work around which also failed which is mentioned int the attachment with screen shots. Can someone please help me out. Thanks, Utkarsh Chauhan Wed, 05 Oct 2016 20:28:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85813#M36760 utkarsh_chauhan 2016-10-05T20:28:00Z Try Utility - Collection https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85814#M36761 Try Utility - Collection Manipulation.Append Field (Text) or Utility - Collection Manipulation.Append Field (Number) Wed, 05 Oct 2016 21:30:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85814#M36761 John__Carter 2016-10-05T21:30:00Z Thanks, I will try this out. https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85815#M36762 Thanks, I will try this out. Thu, 06 Oct 2016 12:36:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85815#M36762 utkarsh_chauhan 2016-10-06T12:36:00Z It worked, however I found a https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85816#M36763 It worked, however I found a root cause why i was getting error when I was writing code in c#. We need to add ""System.DLL"" as part of external references while writing code in c#. It solved my problem of the errors i was getting. Thu, 06 Oct 2016 16:27:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-add-column-to-Data-table-using-code-stage/m-p/85816#M36763 utkarsh_chauhan 2016-10-06T16:27:00Z