Category Archives: .Net

System.Data.Sqlclient for .NET Core

This is a quick tip for getting System.Data.Sqlclient for .NET Core console app. When you look for EntityFramework in Nuget then you will get the error “Package restore failed. Rolling back package changes for ‘ConAppNetCore’”. Get the Microsoft.EntityFrameworkCore. This one … Continue reading

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Update from Visual Studio 2017 15.0 to 15.2

The short blogs shows you one of the ways to upgrade from Visual Studio 2017 15.0 to 15.2. Click on the small flag at your right top corner then you will see “Visual Studio Update” is available. Click on it. … Continue reading

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Shut down without update in Windows 10

Finally you can shut down your Windows 10 without Update. But you need to have Windows 10 1703.

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Windows 7 cannot Windows Update

This short blogs show you how to update your Windows 7 since the Wanna Cry Ransomware is attacking badly at this time. There are pretty of links out there but I remember this official one work for me. Windows Update … Continue reading

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Query Designer grey out in Visual Studio

This blog shows you why the Query Designer is disable or grey out in Visual Studio. When you get the View menu to open the Query Designer then you might realize all the buttons in Query Designer is grey out … Continue reading

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Oracle Enterprise Manager Database Control URL not accessible

This short blog showing you how to access to Oracle Enterprise Manager Database Control URL when you install an Oracle 11g database server in your Windows 10 PC. After you completed the installation of Oracle 11g, you got a link … Continue reading

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System.NullReferenceException: ‘Object reference not set to an instance of an object.’ For array in the class

This blog shows you how to resolve the above error that the normally C# beginner will struggler with. If you read and type the code below then compile it. It will not get any error. class whyarray {     private … Continue reading

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