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Just to distinguish between a view used inside a dialog or used in a foreach loop (customer details) ?
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Since layout pages in Web Pages are not intended to be served directly, they are prefixed with the underscore. And the Web Pages framework has been configured not to allow files with leading underscores in their names from being requested directly.
Rendering a Partial View You can render the partial view in the parent view using the HTML helper methods: @html. Partial() , @html. RenderPartial() , and @html. RenderAction() .
A partial view is a Razor markup file ( . cshtml ) without an @page directive that renders HTML output within another markup file's rendered output. The term partial view is used when developing either an MVC app, where markup files are called views, or a Razor Pages app, where markup files are called pages.
How Partial Views are Created in ASP.NET MVC Application? Right-click on the /Views/Shared folder and Select Add -> View option from the context menu and then provide the following details Check the Create a partial View check box and click on Add button as shown in the below image
Other examples are comments on blogging site, shipping and billing address in the invoice in e-commerce site, etc. If you are coming from an ASP.NET WebForms background, then you can compare the Partial views in the ASP.NET MVC Application with user controls in the ASP.NET WebForms application.
Since layout pages in Web Pages are not intended to be served directly, they are prefixed with the underscore. And the Web Pages framework has been configured not to allow files with leading underscores in their names from being requested directly. Other .cshtml files within Web Pages generally need to be browsable.
Create a New Partial View. To create a partial view, right click on Shared folder -> select Add -> click on View.. Note: If a partial view will be shared with multiple views of different controller folder then create it in the Shared folder, otherwise you can create the partial view in the same folder where it is going to be used.
You don't need an underscore. It's just a convention, and MVC is very keen on using conventions.
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Mike Brind has put this nicely in the question Why does Razor _layout.cshtml have a leading underscore in file name?:
Since layout pages in Web Pages are not intended to be served directly, they are prefixed with the underscore. And the Web Pages framework has been configured not to allow files with leading underscores in their names from being requested directly.
Besides that, I find it very helpful to use this convention to differentiate between full views and partial ones.
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