Row Numbers in RadVirtualGrid

Environment

Product Version	Product	Author
2020.1.113	RadVirtualGrid for WinForms	Desislava Yordanova

Description

This article shows how to display row numbers in RadVirtualGrid.

Solution

It is necessary to handle the CellFormatting event and show the RowIndex in the row header:

        public RadForm1()
        {
            InitializeComponent();

            this.radVirtualGrid1.RowCount = 130;
            this.radVirtualGrid1.ColumnCount = 2;
            this.radVirtualGrid1.CellValueNeeded += radVirtualGrid1_CellValueNeeded;
            this.radVirtualGrid1.CellFormatting += radVirtualGrid1_CellFormatting;
            this.radVirtualGrid1.EnablePaging = true;
            this.radVirtualGrid1.PageSize = 20;
        }

        private void radVirtualGrid1_CellFormatting(object sender, VirtualGridCellElementEventArgs e)
        {
            if (e.CellElement.ColumnIndex < 0 && e.CellElement.RowIndex > -1)
            {
                e.CellElement.DrawText = true; 
                e.CellElement.Text = e.CellElement.RowIndex.ToString();
            }
            else
            {
                e.CellElement.ResetValue(LightVisualElement.DrawTextProperty, ValueResetFlags.Local);
            }
        }

        private void radVirtualGrid1_CellValueNeeded(object sender, VirtualGridCellValueNeededEventArgs e)
        {
            e.Value = "Data " + e.RowIndex + "." + e.ColumnIndex;
        }

 Public Sub New()
    InitializeComponent()
    Me.RadVirtualGrid1.RowCount = 130
    Me.RadVirtualGrid1.ColumnCount = 2
    AddHandler Me.RadVirtualGrid1.CellValueNeeded, AddressOf radVirtualGrid1_CellValueNeeded
    AddHandler Me.RadVirtualGrid1.CellFormatting, AddressOf radVirtualGrid1_CellFormatting
    Me.RadVirtualGrid1.EnablePaging = True
    Me.RadVirtualGrid1.PageSize = 20
End Sub

Private Sub radVirtualGrid1_CellFormatting(ByVal sender As Object, ByVal e As VirtualGridCellElementEventArgs)
    If e.CellElement.ColumnIndex < 0 AndAlso e.CellElement.RowIndex > -1 Then
        e.CellElement.DrawText = True
        e.CellElement.Text = e.CellElement.RowIndex.ToString()
    Else
        e.CellElement.ResetValue(LightVisualElement.DrawTextProperty, ValueResetFlags.Local)
    End If
End Sub

Private Sub radVirtualGrid1_CellValueNeeded(ByVal sender As Object, ByVal e As VirtualGridCellValueNeededEventArgs)
    e.Value = "Data " & e.RowIndex & "." & e.ColumnIndex
End Sub