Public ReadOnly Property ColumnCount As Integer

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

public int ColumnCount {get;}

FarPoint.Win.Spread.Model.BaseSheetDataModel model;

model = (FarPoint.Win.Spread.Model.BaseSheetDataModel)fpSpread1.ActiveSheet.Models.Data;
model.ColumnCount = 4;

model.Changed += new FarPoint.Win.Spread.Model.SheetDataModelEventHandler(model_DataModelChanged);
    
private void button1_Click(object sender, System.EventArgs e)
{
    model.SetValue(0, 2, "DataModel");
}

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

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

model = FpSpread1.ActiveSheet.Models.Data
model.ColumnCount = 4

Dim h As FarPoint.Win.Spread.Model.SheetDataModelEventHandler = AddressOf model_DataModelChanged
AddHandler model.Changed, h

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    model.SetValue(0, 2, "DataModel")
End Sub

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