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How to create multi-column primary key for a DataTable in C#

To create a primary key from multiple columns in DataTable you can create a new DataColumn and pass the columns as array in constructor.


	DataTable dt = new DataTable();
        dt.TableName = "Orders";

        DataColumn dc1 = new DataColumn();
        dc1.ColumnName = "Order Id";
        dc1.DataType = typeof(int);

        DataColumn dc2 = new DataColumn();
        dc2.ColumnName = "ClientName";
        dc2.DataType = typeof(string);

        dt.PrimaryKey = new DataColumn[] { dc1,dc2 };  //Creating primary key here


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