How to make a valued field read only or non editable after the first save of a work item?

by XDK 21. June 2016 20:47


I got a requirement to add a custom field for initial estimate which is required and should be read only or non editable after creating the work item.


Solution is to add a FROZEN rule along with REQUIRED rule as follow

<FIELD name="Inital Estimate" refname="Custom.InitalEstimate" type="Double" reportable="Measures">

   <HELPTEXT>Inital estimate for this task</HELPTEXT>

   <FROZEN />




FROZEN - Prevents users from changing the value of a field once it contains a value. As soon as a user saves the work item with a value in that field, the value can no longer be modified.

REQUIRED - Requires a user to specify a value for the field. Users cannot save a work item until they have assigned values to all required fields.

Tags: ,

Azure DevOps on-premises

Server was unable to process request. The file exists.

by XDK 29. April 2016 08:07


Exception Message: Server was unable to process request. ---> The file exists.


The above exception may occur while saving the work items


Clear the TFS server cache.


Azure DevOps on-premises

Load Test Could not write to file on controller machine error 112

by XDK 29. April 2016 06:37



This error may occur when the Test Controller and Agents runs out disk space. Try to clean up the disk to gain free space or add extra space to the drive. 

Tags: , , ,

Azure DevOps on-premises | Web Performance & Load Tests | TFS 2012 | TFS 2013 | TFS 2015

How to build Visual Studio 2012 later versions solution in TFS 2012 build environment?

by XDK 22. April 2016 09:07


You can build the Visual Studio 2012 later versions in TFS 2012 build environment by configurating the 'ToolPath' property in the TFS 2012 build xaml file.


Open the TFS 2012 build xaml file with the same Visual Studio version (i.e VS 2012) to edit the 'ToolPath' property as below and save the xaml to build.

Visual Studio 2012 ToolPath

On 32-bit machines : C:\Program Files\MSBuild\12.0\bin
On 64-bit machines : C:\Program Files (x86)\MSBuild\12.0\bin

Visual Studio 2015 ToolPath
On 32-bit machines : C:\Program Files\MSBuild\14.0\bin
On 64-bit machines : C:\Program Files (x86)\MSBuild\14.0\bin


Tags: , , , ,

Team Build | Azure DevOps on-premises | TFS 2012 | TFS 2013 | TFS 2015

XML parsing : illegal xml character migration error

by XDK 15. March 2016 13:09


Microsoft.TeamFoundation.Migration.Toolkit.ErrorManagement.MissingErrorRouterException: Runtime error does not meet the error routine policy and there is no conflict manager to log a conflict. ---> System.Data.UpdateException: An error occurred while updating the entries. See the InnerException for details. ---> System.Data.SqlClient.SqlException: XML parsing: line 1, character 78999, illegal xml character


This error might occur when stacktraces are pasted directly into the HTML fields in the work item. In my case, the stacktraces with illegal characters were in Repro Steps field.


I ignored the work items which were causing the failure using the below clause in the migration query.

And processed the ignored work items manually.


Azure DevOps on-premises

About the author

My name is Xavier Dilip Kumar Jayaraj having 16+ years of IT experience which includes solid experience and depth Knowledge in Application Life Cycle Management, Configuration Management, Implementation and Support using TFS on-premises and Azure DevOps. I have invested in gaining DevOps knowledege to expertise with Cloud Computing providers namely Microsoft Azure and Amazon Web Services in recent years. I am very positive to learn and adapt emerging technologies to client’s environment.

Microsoft Certified: Azure Administrator Associate

Microsoft Certified: Azure DevOps Engineer Expert

DevOps Engineer Certificate Program | Transcript 

OTP-AWSD5: AWS IoT: Developing and Deploying an Internet of Things

[PCEP-30-01] PCEP – Certified Entry-Level Python Programmer

Quotes I Like

"Failure will never overtake me if my determination to succeed is strong enough."  - Dr. APJ. Abdul Kalam

"Always be yourself, express yourself, have faith in yourself, do not go out and look for a successful personality and duplicate it." - Bruce Lee

"Technology is just a tool. In terms of getting the kids working together and motivating them, the teacher is the most important." - Bill Gates

"Innovation distinguishes between a leader and a follower." - Steve Jobs



The information provided here is based on my expreriences, troubleshooting and online/offline findings. It can be used as is on your own risk without any warranties and I impose no rights.