I am creating a GridView dynamically, where the BoundFields is created like below:

<code>
Dim nameColumn As New BoundField()
nameColumn.DataField = "myDblNumber"
nameColumn.HeaderText = "The number"
GridView1.Columns.Add(nameColumn)
</code>

How can I make the value in the gridview (in this case a number with decimals) red if the value is negative (less than zero)? I've tried the following, which gave an error (Conversion from string "myDblNumber" to type 'Double' is not valid):

<code>
Dim nameColumn As New BoundField()
nameColumn.DataField = "myDblNumber"
nameColumn.HeaderText = "The number"
GridView1.Columns.Add(nameColumn)
If nameColumn.DataField < 0 Then
   nameColumn.ItemStyle.CssClass = "errLabel"
End If
</code>

Regards,
Roy M. Halvorsen

You are in the right direction. But you would not do this at GridView creation time. You would do it for each item on the Row's Data Bound event. Otherwise you have no data to actually do the comparison on.

So, e.g:

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
 If e.Row.RowType = DataControlRowType.DataRow Then
  If e.Row.DataItem("myDblNumber") < 0 Then ' may have to first cast to a double
   e.Row.Cells(1).CssClass = "whatever" ' change 1 to your cell #
  End If
 End If
End Sub