遍历单元格并选择每个列单元格 -

 grid.ClearSelection（）; 
 for （ int  r =  0 ; r< grid。 RowCount ; r ++）
 grid [columnIndex，r] .Selected = true; 

Ex
===============|==============================
=   Col1 Header|            Col2 Header      |
===============|==============================
=     A        |              1              |
=     B        |              2              |
=     C        |              3              |
=              |                             |
===============|=============================|

While selecting col1 Header means, select A,B,C only. not 1,2,3.

Loop through the cells and select each column cell -

grid.ClearSelection();
for(int r = 0; r < grid.RowCount; r++)
    grid[columnIndex, r].Selected = true;