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I wonder if this issue is for you, please evaluate it and let me know.
I am getting a warning in a dataset when building (or Rebuilding) my web site in VS2008 as follows:

"Errors occured while compiling the Xml schemas in the project. Because of this, Xml intellisense is not available."

I have updated my dotConnect for PostgreSQL version several times since I design such a dataset for the first time and actually I am using version 4.95.180. I had not noticed this warning until I uploaded my site to a production server and performed a test. This test did not work so I went to my code and reviewed it to find out what was going on until I noticed that, after rebuilding my site, I got the warning.

I read an article in MSDN about this issue but I did not get very much help, I do not have experience in Xml Schema Definition.
I will appreciate any comment about this issue.

Respectfully,
Jorge Maldonado

This warning shows that there are some errors in one of the .xsd files of your project. This may be a file containing the schema for one of the data sets used in your application, or some other .xsd file. Please double-click this warning in the Error List window to find the file that causes this problem.

If this is a file with a data set definition, please send us a test project so that we are able to investigate the issue in details. As a workaround, you can also try re-configuring the corresponding data set in your project.

I am sending the sample web site but I want to let you know the following issues. If I build or rebuild the web site with only the datasets then everything goes fine; however, if I include any other class then I start receiving the warning message. The sample includes some classes that do not have anything to do with the datasets. I performed 2 tests:
1. I "excluded" the extra classes and no warnings were shown.
2. I "included" the extra classes and I got a warning.

Regards,
Jorge Maldonado

I have sent a sample project, please confirm that you received it.

With respect,
Jorge Maldonado

Thank you for the test project, we will investigate it and inform you about the results.

Are there any news about this issue?

With respect,
Jorge Maldonado

We are working on this issue, we will inform you as soon as our investigation is completed.

I kindly ask you to let me know how you are doing with this issue, something that I can include in a report I have to prepare showing the progress of the project I am working in. I need to explain why I am taking extra time in this part of the web site.

Best regards,
Jorge Maldonado

Sorry for the delay. We've analyzed the problem with DataSet schema. It is caused by constraints with the same name in different DataSets ('Constraint1' in both dsTicket.xsd and CorteCaja.xsd). Apparently, this is a peculiarity of Visual Studio 2008 Intellisense for Visual Basic projects: we couldn't reproduce the issue with either C# projects or in VB projects under Visual Studio 2010.

To resolve the problem, you can rename Constraint1 in either of these DataSets. The issue should be related to Intellisense only, and should not cause any run-time errors. If you are getting any run-time exceptions, please describe them separately.