Showing posts from October, 2013

How to enable Kerberos Delegation in Google Chrome

* Using Registry Key Set/Add this string registry key [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome] Name: AuthNegotiateDelegateWhitelist Value: * * Using Command Line param --auth-negotiate-delegate-whitelist=* Delegation can be restricted to servers in the specific domain * I’ve tested it with IIS + SQL Server and double hop delegation works fine. You can read more about Google Chrome command line params here .

Remote debugging IIS Web Application from Visual Studio

Setup your debug environment as described in Remote debugging from Visual Studio post. When you click ‘Attach’ select w3wp.exe process. If you’re running Application Pools with multiple version of .Net you might see more than one process so make sure you select the correct one.

DelegConfig Kerberos Delegation Configuration Reporting Tool by Brian Murphy-Booth

DelegConfig is an ASP.Net application to test Kerberos/Delegation configuration on your IIS & SQL Server. Useful for testing double hop authentication issues.

IIS Windows Authentication/Delegation issue with C# Parallel Tasks

When you use double-hop authentication (WebBrowser->IIS->SQL Server) code executed on the webserver inside Parallel.Invoke() or Task.Factory.StartNew() is no longer executed as authenticated user (domain\username) but is being changed to (domain\iisservername$). You can see it in Environment.UserName when debuging. So if you're executing any SQL queries as Tasks you might get permission denied errors. The way to fix it is to pass custom TaskScheduler from CurrentSynchronizationContext Parallel.Invoke( new ParallelOptions() { TaskScheduler = TaskScheduler.FromCurrentSynchronizationContext() }, () => { /*do something here;*/ }, ); Task.Factory.StartNew( () => { /*do something here;*/ }, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.FromCurrentSynchronizationContext() ); This is a good article about SynchronizationContext It's All About the SynchronizationContext

SQL Copy data in batches

-- SOURCE TABLE DECLARE @ Table 1 TABLE ( AsOf DATETIME , Company VARCHAR (50), Name VARCHAR (50) ) INSERT INTO @ Table 1 SELECT ' 20130101 ',' Company1 ',' John ' UNION SELECT ' 20130102 ',' Company2 ',' Tom ' UNION SELECT ' 20130101 ',' Company3 ',' Peter ' UNION SELECT ' 20130102 ',' Company4 ',' Ian ' -- DESTINATION TABLE DECLARE @ Table 2 TABLE ( AsOf DATETIME , Company VARCHAR (50), Name VARCHAR (50) ) -- BATCH TABLE DECLARE @Batches TABLE ( AsOf DATETIME ) INSERT INTO @Batches SELECT DISTINCT AsOf FROM @ Table 1 -- COPY IN BATCHES DECLARE @AsOf DATETIME WHILE ( Exists ( SELECT 1 FROM @Batches)) BEGIN TRY BEGIN TRAN SELECT @AsOf = MIN (AsOf) FROM @Batches PRINT CONVERT ( VARCHAR (20),GETDATE(),20) + ' , ' + ' Copying data for: '+ convert ( VARCHAR (8),@AsOf,112) INSERT INTO @ Table 2 (

C# Convert double to decimal

This is a workaround to Convert.ToDecimal(Double) limitation of 15 significant digits by using ‘R’ Round-trip Format Specifier . Convert.ToDecimal Method (Double) “The Decimal value returned by this method contains a maximum of 15 significant digits. If the value parameter contains more than 15 significant digits, it is rounded using rounding to nearest. The following example illustrates how the Convert.ToDecimal(Double) method uses rounding to nearest to return a Decimal value with 15 significant digits.” decimal .Parse(dbl.ToString(" R ")) [Test] public void ConvertDoubleToDecimal() { Compare(1.00000000000006d, 1.00000000000006M); Compare(1.00000000000004d, 1.00000000000004M); Compare(1.000000000000066d, 1.000000000000066M); Compare(1.000000000000044d, 1.000000000000044M); } private void Compare( double dbl, decimal dec) { Convert.ToDecimal(" 0.d0d. "); var d1 = Convert.ToDecimal(dbl); var d2 = new Decimal(dbl); var d3 = de