Useful DevExpress Videos

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This is a living list of DevExpress videos that I've personally found useful and so are probably good for other DevExpress beginners.

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SQL 2005 SP4 and MSreplication_subscriptions

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If you're trying to apply SQL 2005 SP4 (or any SQL service pack), and it's failing, and you're seeing error "MSP Error:  29537  SQL Server Setup has encountered the following problem: [Microsoft][SQL Native Client][SQL Server]Invalid object name 'MSreplication_subscriptions'", then you've hit this bug which Microsoft is currently saying they "Won't Fix": https://connect.microsoft.com/SQLServer/feedback/details/521231/failure-during-server-script-upgrade-process-on-database-in-sp-vupgrade-replication-procedure#tabs Probably you've done one of 2 things: You're using synonyms that match the system replication table names You've got some vestige replication tables laying around in one of your old databases My case was the latter. The fix was to find the vestige tables and get rid of them. I found them using the following script: [sourcecode language="sql"] /* This will detect db's containing vestiges of Replication
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Hiding an ASPXGridView Delete button with HTMLRowCreated vs. CommandButtonInitialize

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It's pretty typical in Administration forms to need to hide buttons on certain rows for various reasons. Particularly it is nice to hide the Delete button if in fact the row in question is being used in other places in the app. This is a nice feature to let the user know up front that the row in question is in use, rather than them trying to delete it and getting a foreign key related error after the fact. For years now in DevExpress ASPxGridView's I have been handling this in the HtmlRowCreated event. And I have been doing it wrong. Before: protected void gridGiftCodes_HtmlRowCreated ( object sender, DevExpress.Web.ASPxGridViewTableRowEventArgs e) { if (e.RowType == GridViewRowType.Data){ int commandColumnIndex = - 1 ; //Find the command column commandColumnIndex = e.Row.Cells.Count- 1 ; //assume it's the last visible colum //Get the command cell for this row GridViewTableCommandCell cell = e.Row.Cells[commandColumnIndex] as Gri
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SQL Server Deadlocks - Easy Quick Start Guide

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If you find the topic of SQL Server deadlocks a little intimidating and mysterious, you are not alone. But fear not, this Quick Start lays out the practical shortcut I bet is sufficient for most scenarios. Definition: What is a Deadlock A deadlock occurs when 2 threads are competing for similar resources, and Thread 1 HAS A and WANTS B, and Thread 2 HAS B and WANTS A. They’re stuck. SQL Server picks a loser and throws error 1205 "Transaction... has been chosen as the deadlock victim." The BIG PROBLEM if your application has a lot of deadlocks is unpredictable application behavior . This can especially show up in apps that call large stored procs where the failing statement gets rolled back, but the proc itself may just keep on trucking with the next statement. This is all based on what kind of error handling you're doing, whether you have XACT_ABORT on, whether you're doing explicit transactions with BEGIN TRAN or not, etc. Very Probably your application is no
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