Public ReadOnly Property ColumnCount As Integer

Dim instance As SheetSelectionModelEventArgs
Dim value As Integer
 
value = instance.ColumnCount

public int ColumnCount {get;}

FarPoint.Win.Spread.Model.BaseSheetSelectionModel model;

model = (FarPoint.Win.Spread.Model.BaseSheetSelectionModel)fpSpread1.ActiveSheet.Models.Selection;
model.AddSelection(0, 0, 2, 2);

model.Changed += new FarPoint.Win.Spread.Model.SheetSelectionModelEventHandler(model_SelectionModelChanged);
    
private void button1_Click(object sender, System.EventArgs e)
{
    model.AddSelection(4, 2, 2, 3);
}

private void model_SelectionModelChanged(object sender, FarPoint.Win.Spread.Model.SheetSelectionModelEventArgs e)
{
    textBox1.Text = e.ColumnCount.ToString();
}

Friend WithEvents model As FarPoint.Win.Spread.Model.BaseSheetSelectionModel

model = FpSpread1.ActiveSheet.Models.Selection
model.AddSelection(0, 0, 2, 2)

Dim h As FarPoint.Win.Spread.Model.SheetSelectionModelEventHandler = AddressOf model_SelectionModelChanged
AddHandler model.Changed, h

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    model.AddSelection(4, 2, 2, 3)
End Sub

Private Sub model_SelectionModelChanged(ByVal sender As Object, ByVal e As FarPoint.Win.Spread.Model.SheetSelectionModelEventArgs)
    TextBox1.Text = e.ColumnCount.ToString()
End Sub