//设置DataGridView的右键菜单
this.dgv_Users.ContextMenuStrip = cmsDgv;
//设置列的右键菜单
this.dgv_Users.Columns[1].ContextMenuStrip = cmsColumn;
//设置列头的右键菜单
this.dgv_Users.Columns[1].HeaderCell.ContextMenuStrip = cmsHeaderCell;
//设置行的右键菜单
this.dgv_Users.Rows[2].ContextMenuStrip = cmsRow;
//设置单元格的右键菜单
this.dgv_Users[1, 2].ContextMenuStrip = cmsCell;

private void dgv_Users_CellContextMenuStripNeeded(object sender, DataGridViewCellContextMenuStripNeededEventArgs e)
{
 DataGridView dgv = sender as DataGridView;
 if (e.RowIndex < 0)
 {
   //设置列头右键
   e.ContextMenuStrip = cmsHeaderCell;
 }
 else if (e.ColumnIndex < 0)
 { 
   //设置行头右键菜单
   e.ContextMenuStrip = cmsRow;
  }
  else if (dgv[e.ColumnIndex, e.RowIndex].Value.ToString().Equals("男"))
  {
   e.ContextMenuStrip = cmsCell;
  }
  else
  {
   e.ContextMenuStrip = cmsDgv;
  }
}