@Ranjith Gowda M N , Welcome to the Microsoft Q&A platform.
Unfortunately, Azure Stream Analytics cannot stream data directly into a .Net core web app.
Option1: You can visualize data from your Azure IoT Hub in a web application.
Option2: If you want to use Azure Stream Analytics, you need to send the data into supported outputs and then connect to the Web app.
Reference:
Visualize real-time sensor data from your Azure IoT hub in a web application
Creating a simple IoT application using a RaspberryPi+ NET Core and Azure
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Hope this helps. Do let us know if you any further queries.
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