Add a page named ‘Test.aspx’ by right-clicking on the project in Solution Explorer and click on "Add" -> "New Item"
First Way
Step 1: Add a function named ‘load ()’ in javascript which will show a alert message and after that create a onload event in body tag with the calling of ‘load()’.
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Step 2: Run the Application and see the output.
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Second Way
Step 1: Add a javascript alert message with in the body Tag of Page.
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Step 2: Run the Application and see the output.