How to Pivot a DataTable in .NET

So I would have thought this problem would have already been solved by the Internets at large. As it turns out, I couldn’t find a very simple method to solve this relatively simple task. So here’s my attempt

Here’s a dead simple pivot table.

Let’s say I have a table that looks like this:

Person Age Sport
Susan 22 Tennis
Bob 29 Soccer
Terry 16 Basketball

And I want to pivot it to to look like this:

Person Susan Bob Terry
Age 22 29 16
Sport Tennis Soccer Basketball

Here’s How

Private Function PivotTable(oldTable As DataTable, 
                            Optional pivotColumnOrdinal As Integer = 0
                           ) As DataTable
    Dim newTable As New DataTable
    Dim dr As DataRow

    ' add pivot column name

    ' add pivot column values in each row as column headers to new Table
    For Each row In oldTable.Rows

    ' loop through columns
    For col = 0 To oldTable.Columns.Count - 1
        'pivot column doen't get it's own row (it is already a header)
        If col = pivotColumnOrdinal Then Continue For

        ' each column becomes a new row
        dr = newTable.NewRow()

        ' add the Column Name in the first Column
        dr(0) = oldTable.Columns(col).ColumnName

        ' add data from every row to the pivoted row
        For row = 0 To oldTable.Rows.Count - 1
            dr(row + 1) = oldTable.Rows(row)(col)

        'add the DataRow to the new table

    Return newTable
End Function

Then just call like this:

Dim newTable = PivotTable(oldTable, 0)

And that’s that.


  1. Excellent Pivot Table, but how would you cope with multiple instances of the person, e.g. where there is a Surname field as well as a Forename in the table?

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