How to disable sort in DataGridView?

foreach (DataGridViewColumn column in dataGridView.Columns)
{
    column.SortMode = DataGridViewColumnSortMode.NotSortable;
}

Use LINQ:

Datagridview1.Columns.Cast<DataGridViewColumn>().ToList().ForEach(f => f.SortMode = DataGridViewColumnSortMode.NotSortable);

If you want statically make columns not sortable. You can do this way

Open the EditColumns window of the DataGridView control.
Select the column you want to make not sortable on the left side pane.
In the right side properties pane, select the Sort Mode property and select "Not Sortable" in that.

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