troubleshooting Question

UNIQUE constraints

Avatar of mawingpui
mawingpuiFlag for Hong Kong asked on
C#Microsoft SQL Server 2005
2 Comments1 Solution302 ViewsLast Modified:
I have a Data Table and want to combine two column as unique pair in a table.
I search the MSDN library and find the following.

DataColumn.Unique
http://msdn.microsoft.com/en-us/library/system.data.datacolumn.unique(v=VS.90).aspx

DataTable bookTable = new DataTable();
DataColumn bookTitle = bookTable.Columns.Add("BookTitle", typeof(string));
DataColumn bookEdition = bookTable.Columns.Add("BookEdition", typeof(string));

bookTable.Rows.Add("Computer Security Basics", "2000c");
bookTable.Rows.Add("ASP.NET", "2006");
bookTable.Rows.Add("Apache", "1998");
bookTable.Rows.Add("Computing Essentials 99", "1999");
bookTable.Rows.Add("Computing Essentials 2000", "2003 v2");
bookTable.Rows.Add("Java", "2003");
bookTable.Rows.Add("ASP.NET", "2007");

I add the following but seem not work..
bookTitle.Unique = true;
bookEdition.Unique = true;

Do you know the easy way to combine two column as unique pair, that is
PK(BookTitle, BookEdition)

Thanks!
Kevin
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