ResizeGridColumns

gistfile1.cs

    private const int LAST_COL_MARGIN = 12;
    private void ResizeGridColumns()
    {
        var verticalScrollBar = dataGrid.GetDataGridVerticalScrollBar();
        var verticalScrollBarWidth = verticalScrollBar != null ? verticalScrollBar.Width : 0;

        var horizontalScrollbar = dataGrid.GetDataGridHorizontalScrollBar();
        if (horizontalScrollbar != null)
            horizontalScrollbar.Visible = false;

        if (dataGrid.TableStyles.Count > 0)
        {
            var tableStyle = dataGrid.TableStyles[0];

            tableStyle.GridColumnStyles[0].Width = dataGrid.ClientSize.Width - verticalScrollBarWidth - LAST_COL_MARGIN;
        }
    }