Hi Akrash Ejaz,
Thank you for reaching out to Microsoft Q & A forum.
To effectively address and resolve issues regarding IntelliSense for C# in Visual Studio Code, it is advisable to follow these steps:
1.Check for Extension Updates : Ensure the currency of your C# extension for Visual Studio Code by navigating to the Extensions view and querying "C#". Perform updates as necessary.
2.Restart Visual Studio Code : Consider restarting the editor as a preliminary measure, as this action often resolves a variety of issues, including those concerning IntelliSense functionality.
3.Verify .NET SDK Installation : Confirm the presence and suitability of the requisite .NET SDK on your system by executing the command "dotnet --version" within your terminal or command prompt.
4.Check for Project Configuration Issues : When engaged in a specific project, meticulously assess its configuration to validate accuracy. Verify the installation of essential NuGet packages and ensure the successful compilation of the project.
5.Review Omnisharp Logs : Utilize the Omnisharp server logs to scrutinize any potential errors impacting IntelliSense or other functionalities. Access these logs by navigating to View -> Output and selecting "Omnisharp Log".
By diligently following these steps, it is anticipated that the encountered issues can be effectively addressed and resolved.
If you encounter any future issues, please feel free to contact us, and we will be pleased to assist you further.
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Thank you.