Public Sub SetColumnAutoFilterIndex( _
   ByVal column As Integer, _
   ByVal value As Integer _
) 

Dim instance As SheetView
Dim column As Integer
Dim value As Integer
 
instance.SetColumnAutoFilterIndex(column, value)

public void SetColumnAutoFilterIndex( 
   int column,
   int value
)

private void Form1_Load(object sender, EventArgs e)
        {
            fpSpread1.Sheets[0].ColumnHeader.RowCount = 3;
            fpSpread1.Sheets[0].ColumnHeaderAutoTextIndex = 1;
            fpSpread1.Sheets[0].Cells[0, 0].Text = "Testing";
            fpSpread1.Sheets[0].Columns[0, 2].AllowAutoSort = true;
            fpSpread1.Sheets[0].Columns[3].AllowAutoFilter = true;
            fpSpread1.Sheets[0].SetColumnAutoSortIndex(0, 0);
            fpSpread1.Sheets[0].SetColumnAutoFilterIndex(3, 1);          
        }

private void button1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Add(fpSpread1.Sheets[0].GetColumnAutoSortIndex(0).ToString());
            listBox1.Items.Add(fpSpread1.Sheets[0].GetColumnAutoFilterIndex(3).ToString());         
        }

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        FpSpread1.Sheets(0).ColumnHeader.RowCount = 3
        FpSpread1.Sheets(0).ColumnHeaderAutoTextIndex = 1
        FpSpread1.Sheets(0).Cells(0, 0).Text = "Testing"
        FpSpread1.Sheets(0).Columns(0, 2).AllowAutoSort = True
        FpSpread1.Sheets(0).Columns(3).AllowAutoFilter = True
        FpSpread1.Sheets(0).SetColumnAutoSortIndex(0, 0)
        FpSpread1.Sheets(0).SetColumnAutoFilterIndex(3, 1)
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ListBox1.Items.Add(FpSpread1.Sheets(0).GetColumnAutoSortIndex(0).ToString())
        ListBox1.Items.Add(FpSpread1.Sheets(0).GetColumnAutoFilterIndex(3).ToString())
End Sub