Question

I am getting an

 InvalidCastException was unhandled by user: 
   Conversion from String "ORDERDATE" to type "Integer" is not valid. 

The error hits when it gets to the lines with band.SortedColumns.
Any idea why i get this error?

I have the same code for infragistics UltraWinGrid vb.net and I don’t get that error.

        UltraWebGrid1.DataSource = Nothing
        myDataName = Generic.getPrevOrder(dt, username)
        UltraWebGrid1.DataSource = dt

        Dim band As Infragistics.WebUI.UltraWebGrid.UltraGridBand = UltraWebGrid1.DisplayLayout.Bands(0)
        UltraWebGrid1.DisplayLayout.ViewType = Infragistics.WebUI.UltraWebGrid.ViewType.OutlookGroupBy

        band.SortedColumns.Add(band.Columns("ORDERDATE"), True)
        band.SortedColumns.Add(band.Columns("ORDERID"), False)

Answer 1

This could be nothing, but out of curiosity, what happens if you swap these around:

band.SortedColumns.Add(band.Columns("ORDERDATE"), True)
band.SortedColumns.Add(band.Columns("ORDERID"), False)

to

band.SortedColumns.Add(band.Columns("ORDERID"), False)
band.SortedColumns.Add(band.Columns("ORDERDATE"), True)

It could be that the schema of the layout (UltraWebGrid1.DisplayLayout.Bands(0)) is different to what is expected? I can’t see why it should make a difference, but it’s worth ruling it out.