Public Function GetColumnDefinitionIndexFromColumnIndex( _
   ByVal columnIndex As Integer _
) As Integer

Dim instance As FilterColumnDefinitionCollection
Dim columnIndex As Integer
Dim value As Integer
 
value = instance.GetColumnDefinitionIndexFromColumnIndex(columnIndex)

public int GetColumnDefinitionIndexFromColumnIndex( 
   int columnIndex
)

FarPoint.Web.Spread.NamedStyle instyle = new FarPoint.Web.Spread.NamedStyle(); 
FarPoint.Web.Spread.NamedStyle outstyle = new FarPoint.Web.Spread.NamedStyle(); 
instyle.BackColor = Color.Yellow; 
outstyle.BackColor = Color.Aquamarine; 
FarPoint.Web.Spread.FilterColumnDefinitionCollection fcdc = new FarPoint.Web.Spread.FilterColumnDefinitionCollection(); 
FarPoint.Web.Spread.FilterColumnDefinition fcd = new FarPoint.Web.Spread.FilterColumnDefinition(1, FarPoint.Web.Spread.FilterListBehavior.SortByMostOccurrences
| FarPoint.Web.Spread.FilterListBehavior.Default); 
FarPoint.Web.Spread.FilterColumnDefinition fcd1 = new FarPoint.Web.Spread.FilterColumnDefinition(2, FarPoint.Web.Spread.FilterListBehavior.Default);

FarPoint.Web.Spread.FilterColumnDefinition fcd2 = new FarPoint.Web.Spread.FilterColumnDefinition(3); 
fcdc.Insert(0, fcd); 
fcdc.Insert(1, fcd1); 
fcdc.Insert(2, fcd2); 
FarPoint.Web.Spread.StyleRowFilter sf = new FarPoint.Web.Spread.StyleRowFilter(FpSpread1.ActiveSheetView, instyle, outstyle);


foreach (FarPoint.Web.Spread.FilterColumnDefinition x in fcdc) 
{ 
 sf.AddColumn(x); 
}
int c = fcdc.GetColumnDefinitionIndexFromColumnIndex(1);

Dim instyle As New FarPoint.Web.Spread.NamedStyle
Dim outstyle As New FarPoint.Web.Spread.NamedStyle
instyle.BackColor = Color.Yellow
outstyle.BackColor = Color.Aquamarine

Dim fcdc As New FarPoint.Web.Spread.FilterColumnDefinitionCollection
Dim fcd As New FarPoint.Web.Spread.FilterColumnDefinition(1, FarPoint.Web.Spread.FilterListBehavior.SortByMostOccurrences
Or FarPoint.Web.Spread.FilterListBehavior.Default)
Dim fcd1 As New FarPoint.Web.Spread.FilterColumnDefinition(2, FarPoint.Web.Spread.FilterListBehavior.Default)
Dim fcd2 As New FarPoint.Web.Spread.FilterColumnDefinition(3)
fcdc.Insert(0, fcd)
fcdc.Insert(1, fcd1)
fcdc.Insert(2, fcd2)
Dim sf As New FarPoint.Web.Spread.StyleRowFilter(FpSpread1.ActiveSheetView, instyle, outstyle)
Dim x As FarPoint.Web.Spread.FilterColumnDefinition
For Each x In fcdc
      sf.AddColumn(x)
Next
Dim c As Integer = fcdc.GetColumnDefinitionIndexFromColumnIndex(1)