Ключевые поля таблицы в БД Access

foreach (DataColumn dataColumn in dataTable.Columns)
{
    stringBuilder
        .Append(",{allowDBNull:").Append(dataColumn.AllowDBNull)
        .Append(",autoIncrement:").Append(dataColumn.AutoIncrement)
        .Append(",autoIncrementSeed:").Append(dataColumn.AutoIncrementSeed)
        .Append(",autoIncrementStep:").Append(dataColumn.AutoIncrementStep)
        .Append(",caption:").Append(dataColumn.Caption)
        .Append(",columnMapping:").Append(dataColumn.ColumnMapping)
        .Append(",columnName:").Append(dataColumn.ColumnName)
        .Append(",dataType:").Append(dataColumn.DataType)
        .Append(",dateTimeMode:").Append(dataColumn.DateTimeMode)
        .Append(",defaultValue:").Append(dataColumn.DefaultValue)
        .Append(",designMode:").Append(dataColumn.DesignMode)
        .Append(",expression:").Append(dataColumn.Expression)
        .Append(",extendedProperties:").Append(dataColumn.ExtendedProperties)
        .Append(",maxLength:").Append(dataColumn.MaxLength)
        .Append(",namespace:").Append(dataColumn.Namespace)
        .Append(",ordinal:").Append(dataColumn.Ordinal)
        .Append(",readOnly:").Append(dataColumn.ReadOnly)
        .Append(",unique:").Append(dataColumn.Unique)
        .Append("}");
}