How to get the cell value in WinForms GridGroupingControl?

// This event is fired when the current cell is validated, i.e., when editing is completed.
this.gridGroupingControl1.TableControlCurrentCellValidated += new Syncfusion.Windows.Forms.Grid.Grouping.GridTableControlEventHandler(gridGroupingControl1_TableControlCurrentCellValidated);

// This event is fired when a key is pressed.
this.gridGroupingControl1.TableControl.CurrentCellKeyDown += new KeyEventHandler(TableControl_CurrentCellKeyDown);

// Used to store grid current cell value.
GridCurrentCell cc;

// Used to store the cell value.
string cellvalue;

void gridGroupingControl1_TableControlCurrentCellValidated(object sender, Syncfusion.Windows.Forms.Grid.Grouping.GridTableControlEventArgs e)
{
    cc = e.TableControl.CurrentCell;
    cellvalue = cc.Renderer.GetCellValue().ToString();
}

void TableControl_CurrentCellKeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode.Equals(Keys.Enter))
        this.textBox1.Text = cellvalue;
    else
        this.textBox1.Text = string.Empty;
}

'This event is fired when the current cell is validated, i.e., when editing is completed.
AddHandler Me.gridGroupingControl1.TableControlCurrentCellValidated, AddressOf gridGroupingControl1_TableControlCurrentCellValidated

'This event is fired when a key is pressed.
AddHandler Me.gridGroupingControl1.TableControl.CurrentCellKeyDown, AddressOf TableControl_CurrentCellKeyDown

'Used to store grid current cell value.
Dim cc As GridCurrentCell

'Used to store the cell value.
Dim cellvalue As String

Private Sub gridGroupingControl1_TableControlCurrentCellValidated(sender As Object, e As Syncfusion.Windows.Forms.Grid.Grouping.GridTableControlEventArgs)
    cc = e.TableControl.CurrentCell
    cellvalue = cc.Renderer.GetCellValue().ToString()
End Sub

Private Sub TableControl_CurrentCellKeyDown(sender As Object, e As KeyEventArgs)
    If e.KeyCode.Equals(Keys.Enter) Then
        Me.textBox1.Text = cellvalue
    Else
        Me.textBox1.Text = String.Empty
    End If
End Sub