dgvLoadTable.DataSource = null;
crudLoadData(0); //Calls function to load data in datagridview and recordNum is
                 //set to 0 for showing the header only in dgvLoadTable
dgvLoadTable.ReadOnly = false;
dgvLoadTable.AllowUserToAddRows = true;
DataGridViewComboBoxColumn cboIsNew = new DataGridViewComboBoxColumn();
int i= dgvLoadTable.Columns["ColumnName"].Index;
dgvLoadTable.Columns.Insert(i, dgvCol);
dgvLoadTable.Columns[i].HeaderText = dgvLoadTable.Columns[i + 1].HeaderText;
dgvLoadTable.Columns[i + 1].Visible = false;