How to rename file before saving to server using ASP.NET core

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ASP.NET-Core

How can i rename the file before saving it to server i want to based it on the username ? example: mypic.jpg
this is my code:

<pre>  public IActionResult OnPostMyUploader(IFormFile MyUploader)
        {
            // No point loading and resizing the image if we're not going to use it:
            if (MyUploader is null) return new ObjectResult(new { status = "fail" });

            using var image = System.Drawing.Image.FromStream(MyUploader.OpenReadStream());
            using var resized = new Bitmap(image, new System.Drawing.Size(150, 150));
            using var imageStream = new MemoryStream();
            resized.Save(imageStream, ImageFormat.Jpeg);

       
            string uploadsFolder = @"\\10.10.10.67\AQSImages\IdPictures\";
            string filePath = Path.Combine(uploadsFolder, MyUploader.FileName);
            using var fileStream = new FileStream(filePath, FileMode.Create);

            // Reset the current position of the stream:
            imageStream.Seek(0L, SeekOrigin.Begin);
            imageStream.CopyTo(fileStream);

            return new ObjectResult(new { status = "success" });
            //using var image = Image.Load(MyUploader.OpenReadStream());
            //image.Mutate(x => x.Resize(256, 256));
            ////var image = Image.FromStream(MyUploader.OpenReadStream());
            ////var resized = new Bitmap(image, new Size(256, 256));
            ////using var imageStream = new MemoryStream();
            ////resized.Save(imageStream, ImageFormat.Jpeg);
            ////var imageBytes = imageStream.ToArray();

            //if (MyUploader != null)
            //{
            //    string uploadsFolder = @"\\10.10.10.67\AQSImages\IdPictures\";
            //    string filePath = Path.Combine(uploadsFolder, MyUploader.FileName);
            //    using (var fileStream = new FileStream(filePath, FileMode.Create))
            //    {
            //     image.CopyTo(fileStream);
            //    }
            //    return new ObjectResult(new { status = "success" });
            //}
            //return new ObjectResult(new { status = "fail" });

            //////Better use extension method
            ////string customRoot = @"\\10.10.10.67\AQSImages\IdPictures\";
            ////if (!Directory.Exists(customRoot))
            ////{
            ////    Directory.CreateDirectory(customRoot);
            //}
        }

This is the username input type in my view:

<pre><div class="col-4">
                                    <label class="w-100">Username</label>
                                    <input id="empUsername" class="input-form w-100" disabled>
                                </div>

What I have tried:

javascript - Upload and change a new name for image in ASP.NET MVC - Stack Overflow[^]