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Editorial Team
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Asked: 2026-05-24T18:54:58+00:00

I have a DataSet in UserAdmin.xsd with many DataTable s. Most of the data

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I have a DataSet in UserAdmin.xsd with many DataTables. Most of the data come directly from stored procedures. However for one of the tables, I would like to add another column which uses a C# function defined in another file.

I put for the expression for that column: Helper.ObtainUserInfo(user_nm, "displayname"); but that gives me an error “undefined function call”.

Helper.cs is located under App_Code/Common/ and the namespace is COM.A.B.C. UserAdmin.xsd is located under App_Code/.

How can I access the function ObtainUserInfo()? Is there something like a using keyword that I could use?

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1 Answer

  1. Editorial Team

    You cannot use DataColumn.Expression to call a .NET-Method to obtain a value. You must refer a column in this table or one of the parent/child tables to calculate the value. For more informations on what you can(‘t) do with Expressions look here: http://msdn.microsoft.com/en-us/library/system.data.datacolumn.expression%28v=VS.100%29.aspx

    Instead of using a method or an expression, i would recommend to do this with SQL whenever possible.

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