DataGridView : disable the column header sorting

VB.NET
 For Each column As DataGridViewColumn In DataGridView1.Columns
            column.SortMode = DataGridViewColumnSortMode.NotSortable
 Next

C#
foreach (DataGridViewColumn column in DataGridView1.Columns)
{
    column.SortMode = DataGridViewColumnSortMode.NotSortable;
}