dataGridView에 CheckBoxColumn 하드코딩으로 넣기

DataGridViewCheckBoxColumn chkBillable = new DataGridViewCheckBoxColumn();

chkBillable.Name = "colTimeSheetBillable";

chkBillable.HeaderText = "Billable";

chkBillable.DataPropertyName = "TimeSheetBillable";

chkBillable.ReadOnly = true;

dataGridTimesheet.Columns.Add(chkBillable);