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Update Checker

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3.12 (10 votes)
25 Sep 2019CPOL
Update Checker


I was looking for a simple solution of a common problem: you have created an update of your application.

After you uploaded it to the server, you want that all the "old" applications (clients) get a message about this new version by checking for this automatically.


My solution is very simple, the .NET DLL is small.

This XML file manages the updates (new Version 9.1.5 at

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

The main function Check4Update() reads the XML file and parses it:

XmlDocument oDom = new XmlDocument();

string str = oDom.SelectSingleNode("//currentVersion/major").InnerText;
Int32.TryParse(str, out _nMajor);

str = oDom.SelectSingleNode("//currentVersion/minor").InnerText;
Int32.TryParse(str, out _nMinor);

str = oDom.SelectSingleNode("//currentVersion/build").InnerText;
Int32.TryParse(str, out _nBuild); 

_sNewVersionPath = oDom.SelectSingleNode("//path").InnerText;

Using the Code

This solution is a .NET library (DLL) and can be used in every C# project by adding it as reference:

Image 1

Then you only need to create an instance of it:

axcsCheck4Update.axMain oCheckClient = new axcsCheck4Update.axMain(txtXml.Text);

int nMajor = oCheckClient.GetVersion(axcsCheck4Update.enVerion.EMajor);
int nMinor = oCheckClient.GetVersion(axcsCheck4Update.enVerion.EMinor);
int nBuild = oCheckClient.GetVersion(axcsCheck4Update.enVerion.EBuild);

string strPath = oCheckClient.GetNewVersionPath();

After getting the current version's number, you can compare it to your version's number:

// Get my own version's numbers
Assembly assembly = Assembly.GetExecutingAssembly();
FileVersionInfo fileVersionInfo = FileVersionInfo.GetVersionInfo(assembly.Location);

int nAppMajor = fileVersionInfo.FileMajorPart;
int nAppMinor = fileVersionInfo.FileMinorPart;
int nAppBuild = fileVersionInfo.FileBuildPart;

And, if they are different, you can point users to this new version like this:

Image 2


  • Version 1.0.0 released


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer
Germany Germany

I'm a software developer living in Germany with my family (wife & 2 sons).
My hobbies: sport, traveling, books (former reading, now hearing).
Welcome to my homepage:

Comments and Discussions

Questionlink is broken, and ... Pin
BillWoodruff29-Sep-19 23:08
mveBillWoodruff29-Sep-19 23:08 
AnswerRe: link is broken, and ... Pin
_duDE1-Oct-19 5:23
professional_duDE1-Oct-19 5:23 
QuestionVery Handy Pin
  Forogar  26-Sep-19 4:22
professional  Forogar  26-Sep-19 4:22 
AnswerRe: Very Handy Pin
_duDE27-Sep-19 0:40
professional_duDE27-Sep-19 0:40 

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Posted 24 Sep 2019

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