[Solved] OnPostUploadAsync it is not being called in ASP.Net Core Razor Pages

chandradeep.19830110 says:

<input type="submit" value="Submit" />

You are missing the asp-page-handler attribute and make the IFormFile parameter as list collection, since you are uploading multiple files.

HTML

<form method="post" enctype="multipart/form-data">
    <input type="text" value="" asp-for="mytestmodel.Name" />
    <input type="file" value="" multiple name="MyFiles" />
    <input type="submit" value="Submit" asp-page-handler="Upload" />
</form>

PageModel

public async Task<IActionResult> OnPostUploadAsync(List<IFormFile> MyFiles)
{
    int k = await Task.FromResult(0);
    return Page();
}