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Editorial Team
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Asked: 2026-05-30T18:15:47+00:00

This is driving me nuts. I added a column to a DataSet in my

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This is driving me nuts. I added a column to a DataSet in my SSRS Report. I refreshed the fields and now the column displays in SSRS.

I want to place the value of this in a TextBox.

  1. I added TextBox to the report
  2. I right click the TextBox and pick “Expression”
  3. In the dialog box I click Datasets –> MyDataSet –> First(MyNewColumn)

The results in the expression in the SSRS TextBox being 

=First(Fields!MyNewColumnName.Value, "MyDataSet")

I then get a red squiggly line and an error that says “Unknown Collection Member”. This is a lie, because it is part of the collection. I have verified that this value is returned when I run my query in SQL2008. When I preview the report I get “#Error”

Does anyone know what the real problem is here?

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1 Answer

  1. Editorial Team

    I deleted the .data file, which I believed forced SSRS to rebuild it. After this happened, the report worked as expected.

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