ตั้ง Primary key สำหรับ DataTable

The first example defines a single column as the primary key

Dim columns(1) As DataColumn
columns(0) = workTable.Columns("CustID")
workTable.PrimaryKey = columns

The following example defines two columns as a primary key.

Dim keyColumn(2) As DataColumn
keyColumn(0) = workTable.Columns("CustLName")
keyColumn(1) = workTable.Columns("CustFName")
workTable.PrimaryKey = keyColumn