C# combobox手动赋值

DataTable dt = new DataTable();
dt.Columns.Add("REPAIR_VALUE");
dt.Columns.Add("REPAIR_NAME");
DataRow dr = dt.NewRow();
dr["REPAIR_VALUE"] = "Y";
dr["REPAIR_NAME"] = "修复";
dt.Rows.Add(dr);
DataRow dr1 = dt.NewRow();
dr1["REPAIR_VALUE"] = "N";
dr1["REPAIR_NAME"] = "未修复";
dt.Rows.Add(dr1);
cmbRepair.ValueMember = "REPAIR_VALUE";
cmbRepair.DisplayMember = "REPAIR_NAME";
cmbRepair.DataSource = dt;
cmbRepair.SelectedIndex = 0;