Code Library - C# / VB.NET
Windows forms controls, classes, methods and more that you might find useful in general .NET programming.
I previously wrote that the .NET 2.0 DataTableReader class is really handy, but unfortunately there is no DataViewReader class. Thus, the only way to use the IDataReader interface with a sorted/filtered DataView was to first use the ToRows() method of the view to create a brand new DataTable, and then call CreateDataReader() on that new table. This is not the most efficient process when all you want to do is enumerate a DataView.
So, here's a solution: a simple, efficient, mostly-complete DataViewReader class. Just create a new instance of it passing in the source DataView and off you go. This will...
I recently helped a friend out who only had access to SQL Server Management Studio Express, and he needed to copy a database locally from his PC to his remote web hosting company. Normally, the process is a simple backup/restore, but his hosting company does not allow restoring databases. Luckily, however, the company does allow direct access to his hosted database via client tools such as SSMS. Unluckily, SSMS Express does not include any tools that allow you to export data to a remote server.
So, here's what we did: First, we scripted out the entire database, including all tables, indexes,...
In ASP.NET, we often would like to output "grouped" data on our web pages, like this:
Customer Product Sales
-------- ---------- -----
Product 1 $200
Product 2 $437
Product 3 $523
The XLZ Company
Product 1 $240
Product 2 $892
Product 3 $395
The easiest way to do this is with nested Repeater controls; one for the outer group (Customers, this case), and within that Repeater's ItemTemplate we'd have another Repeater control for the details (Products).
To use nested repeaters, you would return two separate result sets from SQL:
A "Customers" result set,...
I had to do some data clean up the other day, and really needed some regular expression replacements to do the job. Since .NET has a great RegularExpressions namespace, and since SQL 2005 allows you to integrate .NET CLR functions in your T-SQL code, I thought I'd go ahead and experiment with creating a RegExReplace() function.
Time for another exciting edition of the mailbag! This time: making an improvement to the C# Pivot function.
As promised in my last post, here is some performance testing to help you determine the performance benefits (if any) of performing your crosstabs at the presentation or code layer, as opposed to forcing SQL Server to do this.
In my last post, I spoke briefly about how I felt that in general crosstabbing data is something that a presentation layer should do and not the database. Consider the result of a crosstab operation -- the columns returned will vary depending on the data. There is pretty much no further manipulation you can do with that result in T-SQL; in the relational database world, the column names of our database objects should be constants and not continually changing as the data changes. Also, in T-SQL there is no easy way to dynamically pivot data, and even doing it with...